Display device

ABSTRACT

Disclosed is a display device. The display device of the present disclosure includes a flexible display panel, a source printed circuit board (S-PCB) located adjacent to a lower side of the flexible display panel and electrically coupled to the flexible display panel, a roller comprising a seating portion accommodating the S-PCB, wherein the seating portion is formed by removing a part of an outer circumferential surface of the roller, wherein the flexible display panel is wound around or unwound from the roller, and a cover extending in a longitudinal direction of the roller to cover the S-PCB.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a continuation of U.S. patent application Ser. No.17/100,606, filed on Nov. 20, 2020, which claims the benefit of earlierfiling date and right of priority to Korean Patent Application No.10-2019-0150451, filed on Nov. 21, 2019, the contents of which are allhereby incorporated by reference herein their entirety.

BACKGROUND OF THE INVENTION 1. Field of the Invention

The present disclosure relates to a display device.

2. Description of the Related Art

As the information society has been developed, the demand for displaydevice is increasing in various forms, and accordingly, in recent years,various display devices such as liquid crystal display device (LCD),plasma display panel (PDP), electroluminescent display (ELD), vacuumfluorescent display (VFD), and the like have been studied and used.

Among these, a display device using organic light emitting diode (OLED)has excellent luminance and viewing angle characteristics in comparisonwith liquid crystal display device and does not require a backlightunit, thereby being implemented in an ultra thin type.

In addition, a flexible display panel can be bent or wound around aroller. The flexible display panel may be used to implement a displaydevice that unfolds on a roller or winds around the roller. Many studieshave been made on a structure for winding a flexible display panelaround a roller or unwinding the flexible display panel from the roller.

SUMMARY OF THE INVENTION

The present disclosure has been made in view of the above problems, andprovides a display device capable of preventing S-PCB damage that mayoccur in the process of winding a display panel around a roller orunwinding the display panel from the roller.

The present disclosure further provides a display device in which adisplay panel can be stably wound around or unwound from a roller havinga flat surface on which S-PCB is seated.

The present disclosure further provides a display device capable ofpreventing a S-PCB cover from being dislocated from its regular positionin the process of winding a display panel around a roller or unwindingthe display panel from the roller.

In accordance with an aspect of the present disclosure, the above andother objects can be accomplished by the provision of a display deviceincluding a flexible display panel, a source printed circuit board(S-PCB) located adjacent to a lower side of the flexible display paneland electrically coupled to the flexible display panel, a rollercomprising a seating portion accommodating the S-PCB, wherein theseating portion is formed by removing a part of an outer circumferentialsurface of the roller, wherein the flexible display panel is woundaround or unwound from the roller, and a cover extending in alongitudinal direction of the roller to cover the S-PCB.

BRIEF DESCRIPTION OF THE DRAWINGS

The above and other objects, features and advantages of the presentdisclosure will be more apparent from the following detailed descriptionin conjunction with the accompanying drawings, in which:

FIGS. 1 to 76 are diagrams illustrating examples of a display deviceaccording to embodiments of the present disclosure.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

Description will now be given in detail according to exemplaryembodiments disclosed herein, with reference to the accompanyingdrawings. For the sake of brief description with reference to thedrawings, the same or equivalent components may be denoted by the samereference numbers, and description thereof will not be repeated.

In general, suffixes such as “module” and “unit” may be used to refer toelements or components. Use of such suffixes herein is merely intendedto facilitate description of the specification, and the suffixes do nothave any special meaning or function.

In the present disclosure, that which is well known to one of ordinaryskill in the relevant art has generally been omitted for the sake ofbrevity. The accompanying drawings are used to assist in easyunderstanding of various technical features and it should be understoodthat the embodiments presented herein are not limited by theaccompanying drawings. As such, the present disclosure should beconstrued to extend to any alterations, equivalents and substitutes inaddition to those which are particularly set out in the accompanyingdrawings.

It will be understood that although the terms first, second, etc. may beused herein to describe various elements, these elements should not belimited by these terms. These terms are only used to distinguish oneelement from another.

It will be understood that when an element is referred to as being“connected with” another element, there may be intervening elementspresent. In contrast, it will be understood that when an element isreferred to as being “directly connected with” another element, thereare no intervening elements present.

A singular representation may include a plural representation unlesscontext clearly indicates otherwise.

In the following description, even if an embodiment is described withreference to a specific figure, if necessary, reference numeral notshown in the specific figure may be referred to, and reference numeralnot shown in the specific figure is used when the reference numeral isshown in the other figures.

Referring to FIG. 1 , a display device 100 may include a display unit 20and a housing 30. The housing 30 may have an internal space. At least aportion of the display unit 20 may be located inside the housing 30. Atleast a portion of the display unit 20 may be located outside thehousing 30. The display unit 20 may display a screen.

The direction parallel to the longitudinal direction of the housing 30may be referred to as a first direction DR1, +x axis direction, −x axisdirection, a left direction, or a right direction. The direction inwhich the display unit 20 displays a screen may be referred to as +zaxis, a forward direction, or the front. The direction opposite to thedirection in which the display unit 20 displays the screen may bereferred to as −z axis, a rearward direction, or the rear. A thirddirection DR3 may be parallel to +z axis direction or −z axis direction.The direction parallel to the height direction of the display device 100may be referred to as a second direction DR2, +y axis direction, the −yaxis direction, an upper direction, or a lower direction.

The third direction DR3 may be a direction perpendicular to the firstdirection DR1 and/or the second direction DR2. The first direction DR1and the second direction DR2 may be collectively referred to as ahorizontal direction. In addition, the third direction DR3 may bereferred to as a vertical direction. A left and right direction LR maybe parallel to the first direction DR1, and an up and down direction UDmay be parallel to the second direction DR2.

Referring to FIG. 2 , the display unit 20 may be entirely located insidethe housing 30. At least a portion of the display unit 20 may be locatedoutside the housing 30. The degree to which the display unit 20 isexposed to the outside of the housing 30 may be adjusted as necessary.

Referring to FIG. 3 , the display unit 20 may include a display panel 10and a plate 15. The display panel 10 may be flexible. For example, thedisplay panel 10 may be an organic light emitting display (OLED).

The display panel 10 may have a front surface for displaying an image.The display panel 10 may have a rear surface facing the front surface.The front surface of the display panel 10 may be covered with a lighttransmissive material. For example, the light transmissive material maybe synthetic resin or film.

The plate 15 may be coupled, fastened or attached to the rear surface ofthe display panel 10. The plate 15 may include a metal material. Theplate 15 may be referred to as a module cover 15, a cover 15, a displaypanel cover 15, a panel cover 15, or an apron 15.

Referring to FIG. 4 , the plate 15 may include a plurality of segments15 c. A magnet 64 may be located inside a recess 118 of the segment 15c. The recess 118 may be located on a surface of the segment 15 c facingthe display panel 10. The recess 118 may be located in the front surfaceof each segment 15 c. Since the magnet 64 is accommodated inside therecess 118, the magnet 64 may not protrude from the segment 15 c. Thedisplay panel 10 may be flat without being wrinkled even when it is incontact with the segment 15 c.

Referring to FIG. 5 , a plurality of magnets 64 may be located on a link73. For example, at least one magnet 64 may be located on a first arm 73a and at least one magnet 64 may be located on a second arm 73 b. Theplurality of magnets 64 may be spaced apart from each other.

Referring to FIG. 6 , one magnet 64 may be located on the first arm 73 aand the second arm 73 b, respectively. The magnet 64 may have a shapeextended in the long side direction of the first arm 73 a and the secondarm 73 b. Since the magnet 64 has a shape extended in the long sidedirection of the first arm 73 a and the second arm 73 b, the area of theportion where the link 73 is in close contact with the display panel andthe module cover may be increased. Accordingly, the adhesion between thelink 73 and the display panel and the module cover may be strengthened.

Referring to FIG. 7 , the magnet 64 may be located in a depression 321formed in the link 73. The depression 321 may have a shape recessedinward of the link 73. The magnet 64 may be coupled to the link 73through at least one screw 187.

The width LHW in which the depression 321 is recessed inwardly of thelink 73 may be equal to or larger than the thickness MGW of the magnet64. If the thickness MGW of the magnet 64 is larger than the width LHWof the depression 321, the display panel 10 and the module cover 15 maynot be in close contact with the link 73. In this case, the displaypanel 10 may be wrinkled or may not be flat.

A panel protector 97 may be located in the rear surface of the displaypanel 10. The panel protector 97 may prevent the display panel 10 frombeing damaged due to friction with the module cover 15. The panelprotector 97 may include a metal material. The panel protector 97 mayhave a very thin thickness. For example, the panel protector 97 may havea thickness of about 0.1 mm.

Since the panel protector 97 contains a metal material, magneticattraction between the panel protector 97 and the magnet 64 may occur.Accordingly, the module cover 15 located between the panel protector 97and the link 73 may be in close contact with the magnet 64 even if itdoes not contain a metal material.

Referring to FIG. 8 , the module cover 15 may be in close contact withthe link 73 by an upper bar 75 of the upper side and a guide bar 234 ofthe lower side (see FIG. 15 ). A portion between the upper bar 75 andthe guide bar 234 of the link 73 may not be in close contact with themodule cover 15. Alternatively, the central portion of the link 73 maynot be in close contact with the module cover 15. The central portion ofthe link 73 may be near an arm joint 152. In this case, the distanceAPRD1, APLD2 between the module cover 15 and the link 73 may not beconstant. In this case, the display panel 10 may be bent or twisted.

Referring to FIG. 9 , when the magnet 64 is located in the depression321 of the link 73, the magnet 64 attracts the panel protector 97, sothat the module cover 15 can also be in close contact with the magnet atthe same time. That is, the central portion of the link 73 may be inclose contact with the module cover 15.

Referring to FIG. 10 , a bead 136 may be formed in the upper surface ofthe segment 15 b. The bead 136 may have a shape recessed inwardly ofsegment 15 b. The bead 136 may have a shape recessed in the −y axisdirection. For example, the bead 136 may be formed by pressing thesegment 15 b. A plurality of beads 136 may be formed on the segment 15b. The plurality of beads 136 may be spaced apart from each other. Thebead 136 may enhance the rigidity of segment 15 b. The bead 136 canprevent the shape of the segment 15 b from being deformed due to anexternal impact.

Referring to FIG. 11 , a source PCB 120 may be located above the modulecover 15. In the case of roll-up or roll-down, the position of thesource PCB 120 may be changed with the movement of the module cover 15.A FFC cable 231 may be located in the central portion of the modulecover 15 based on the first direction. The FFC cable 231 may be locatedin both ends of the module cover 15 based on the first direction.

Referring to FIG. 12 , the segment 15 d may include a depression 425recessed in the −z axis direction. The depression 425 may form a spacebetween the display panel 10 and the module cover 15. The FFC cable 231may be accommodated in a space formed by the depression 425. Inaddition, the depression 425 may improve the rigidity of the segment 15d.

The bead 136 may be located on the segment 15 d excluding a portionwhere the depression 425 is located. The bead 136 may not be located inthe portion where the depression 425 is located because the thickness ofthe segment 15 d in the third direction becomes thinner.

Referring to FIG. 13 , a penetrating portion 437 may be located in thecentral portion of the segment 15 e based on the first direction. Thepenetrating portion 437 may penetrate the central portion of the segment15 e in the second direction. That is, the penetrating portion 437 maybe a hole located in the segment 15 e. The penetrating portion 437 maybe a portion where the FFC cable 231 is located. Since the penetratingportion 437 is formed in the segment 15 e, the thickness of the segment15 e may be reduced in comparison with the case where the FFC cable 231is located in the depression 425.

The bead 136 may be located on the segment 15 e excluding a portionwhere the penetrating portion 437 is located. In the portion where thepenetrating portion 437 is located, the bead 136 may not be locatedbecause the thickness of the segment 15 e in the third direction becomesthinner.

Referring to FIG. 14 , a top case 167 may cover the source PCB 120 andthe upper bar 75 as well as the display panel 10 and the module cover15. One surface of the upper bar 75 may be coupled to the rear surfaceof the module cover 15, and the other surface thereof may be coupled tothe source PCB 120. The upper bar 75 may be fixed to the module cover 15to support the source PCB 120.

The lower end of the FFC cable 231 may be connected to a timingcontroller board 105 (see FIG. 15 ) inside a panel roller 143 (see FIG.15 ). The FFC cable 231 may be wound around or unwound from the panelroller 143 together with the display unit 20.

A portion of the FFC cable 231 may be located between the display panel10 and the module cover 15. A portion of the FFC cable 231 locatedbetween the display panel 10 and the module cover 15 may be referred toas a first portion 231 a. The first portion 231 a may be located in thedepression 425 formed by the plurality of segments 15 d. Alternatively,the first portion 231 a may be accommodated in the depression 425 formedby the plurality of segments 15 d.

A portion of the FFC cable 231 may penetrate the segment 15 f. A portionof the FFC cable 231 that passes through the segment 15 f may bereferred to as a second portion 231 b. The segment 15 f may include afirst hole 521 a formed in the front surface and a second hole 521 bformed in the rear surface. The first hole 521 a and the second hole 521b may be connected to each other to form a single hole 521. The hole 521may penetrate the segment 15 f in the third direction. The secondportion 231 b may penetrate the hole 521. The hole 521 may be referredto as a connection hole 521.

The upper end of the FFC cable 231 may be electrically connected to thesource PCB 120. A part of the FFC cable 231 may be located in the rearsurface of the module cover 15. A portion of the FFC cable 231 locatedin the rear surface of the module cover 15 may be referred to as a thirdportion 231 c. The third portion 231 c may be electrically connected tothe source PCB 120.

The third portion 231 c may be covered by the top case 167. Accordingly,the third portion 231 c may not be exposed to the outside.

Referring to FIG. 15 , the FFC cable 231 may be connected to the timingcontroller board 105 mounted in the panel roller 143. A penetrating hole615 may be formed on the panel roller 143, and the FFC cable 231 may beconnected to the timing controller board 105 through the penetratinghole 615.

The penetrating hole 615 may be located in one side of the panel roller143 and may penetrate an outer circumferential portion of the panelroller 143. The FFC cable 231 may be connected to one side of the timingcontroller board 105 through the penetrating hole 615.

Even when the FFC cable 231 is located in the outer circumference of thepanel roller 143, it may maintain the connection with the timingcontroller board 105 due to the penetrating hole 615. Accordingly, theFFC cable 231 may rotate together with the panel roller 143 to preventtwisting.

A part of the FFC cable 231 may be wound around the panel roller 143. Aportion of the FFC cable 231 wound around the panel roller 143 may bereferred to as a fourth portion 231 d. The fourth portion 231 d may bein contact with the outer circumferential surface of the panel roller143.

A part of the FFC cable 231 may pass through the penetrating hole 615. Aportion of the FFC cable 231 passing through the penetrating hole 615may be referred to as a fifth portion 231 e.

The lower end of the FFC cable 231 may be electrically connected to thetiming controller board 105. A part of the FFC cable 231 may be locatedinside the panel roller 143. A portion of the FFC cable 231 locatedinside the panel roller 143 may be referred to as a sixth portion 231 f.The sixth portion 231 f may be electrically connected to the timingcontroller board 105.

Referring to FIG. 16 , the lower end of the display panel 10 may beconnected to the roller 143. The display panel 10 may be wound around orunwound from the roller 143. The front surface of the display panel 10may be coupled to the plurality of source PCBs 120. The plurality ofsource PCBs 120 may be spaced apart from each other.

A source chip on film (COF) 123 may connect the display panel 10 and thesource PCB 120. The source COF 123 may be located in the front surfaceof the display panel 10. The roller 143 may include a first part 331 anda second part 337. The first part 331 and the second part 337 may befastened by a screw. The timing controller board 105 may be mounted inthe roller 143.

The source PCB 120 may be electrically connected to the timingcontroller board 105. The timing controller board 105 may send digitalvideo data and the timing control signal to the source PCB 120.

The cable 117 may electrically connect the source PCB 120 and the timingcontroller board 105. For example, the cable 117 may be a flexible flatcable (FFC). The cable 117 may penetrate the hole 331 a. The hole 331 amay be formed in a seating portion 379 or the first part 331. The cable117 may be located between the display panel 10 and the second part 337.

The seating portion 379 may be formed in an outer circumference of thefirst part 331. The seating portion 379 may be formed by stepping aportion of the outer circumference of the first part 331. The seatingportion 379 may form a space B. When the display unit 20 is wound aroundthe roller 143, the source PCB 120 may be accommodated in the seatingportion 379. Since the source PCB 120 is accommodated in the seatingportion 379, the source PCB 120 may not be twisted or bent, anddurability may be improved.

The cable 117 may electrically connect the timing controller board 105and the source PCB 120.

Referring to FIG. 17 , the roller 143 wound around with the display unit20 may be installed in a first base 31. The first base 31 may be abottom surface of the housing 30. The roller 143 may be extended alongthe longitudinal direction of the housing 30. The first base 31 may beconnected to the side surface 30 a of the housing 30.

Referring to FIGS. 18 and 19 , the beam 31 a may be formed in the firstbase 31. The beam 31 a may improve the bending or torsional rigidity ofthe first base 31. Many components may be installed in the first base31, and the first base 31 can receive a large load. Since the rigidityof the first base 31 is improved, sagging due to the load can beprevented. For example, the beam 31 a may be formed by a pressingprocess.

The second base 32 may be spaced upward from the first base 31. Thespace S1 may be formed in the first base 31 and the second base 32. Theroller 143 wound around with the display unit 20 may be accommodated inthe space S1. The roller 143 may be located between the first base 31and the second base 32.

The second base 32 may be connected to the side surface 30 a of thehousing 30. The bracket 33 may be fastened to the upper surface of thefirst base 31. The bracket 33 may be fastened to the side surface 30 aof the housing 30.

The beam 32 a may be formed in the second base 32. The beam 32 a mayimprove the bending or torsional rigidity of the second base 32. Forexample, the beam 32 a may be formed by a press process.

A third part 32 d may be connected to the first part 32 b and the secondpart 32 c. A fourth part 32 e may be connected to the first part 32 band the second part 32 c. A space S2 may be formed between the thirdpart 32 d and the fourth part 32 e. Accordingly, bending or torsionalrigidity of the second base 32 may be improved. The third part 32 d maybe referred to as a reinforcing rib 32 d or a rib 32 d. The fourth part32 e may be referred to as a reinforcing rib 32 e or a rib 32 e.

Many components can be installed in the second base 32 and the secondbase 32 can receive a large load. As the rigidity of the second base 32is improved, sagging due to the load can be prevented.

A first reinforcing plate 34 may be located between the first base 31and the second base 32. The first reinforcing plate 34 and the secondbase 32 may be fastened by a screw. The first reinforcing plate 34 maysupport the second base 32. The first reinforcing plate 34 may preventsagging of the second base 32. The first reinforcing plate 34 may belocated in the central portion of the first base 31 or in the centralportion of the second base 32. The first reinforcing plate 34 mayinclude a curved portion 34 a. The curved portion 34 a may be formedalong the roller 143. The curved portion 34 a may not be in contact withthe roller 143 or the display unit 20 wound around the roller 143. Thecurved portion 34 a may maintain a certain distance from the roller 143so as not to interfere with the rotation of the roller 143.

A second reinforcing plate 35 may be fastened to the first base 31 andthe first reinforcing plate 34. The second reinforcing plate 35 maysupport the first reinforcing plate 34. The second reinforcing plate 35may be located behind the first reinforcing plate 34. The secondreinforcing plate 35 may be located behind the first base 31. The secondreinforcing plate 35 may be located perpendicular to the first base 31.The second reinforcing plate 35 may be fastened to the beam 31 a of thefirst base 31. The second base 32 may face the front surface or rearsurface of the housing 30.

Referring to FIG. 20 , the second base 32 f may not form a space. Whenthe load that the second base 32 f receives is not large, the secondbase 32 f may have sufficient rigidity by including the beam 32 g. Thefirst base 31′ may include a beam 31 a′.

Referring to FIGS. 21 and 22 , a motor assembly 810 may be installed inthe second base 32. Drive shaft of the motor assembly 810 may be formedin both sides. The right driving shaft and the left driving shaft of themotor assembly 810 may rotate in the same direction. Alternatively, theright driving shaft and the left driving shaft of the motor assembly 810may rotate in opposite directions.

The motor assembly 810 may include a plurality of motors. The pluralityof motors may be connected in series with each other. The motor assembly810 may output a high torque by connecting a plurality of motors inseries.

A lead screw 840 may be located in the left side and the right side ofthe motor assembly 810, respectively. The motor assembly 810 may beconnected to the lead screw 840. A coupling 811 may connect the leadscrew 840 and the drive shaft of the motor assembly 810.

The lead screw 840 may be threaded along the longitudinal direction. Thedirection of the threads formed in the right lead screw 840 and thedirection of the threads formed in the left lead screw 840 may beopposite to each other. The direction of the threads formed in the rightlead screw 840 and the direction of the threads formed in the left leadscrew 840 may be the same. The pitches of the left lead screw 840 andthe right lead screw 840 may be the same.

The bearing 830 a, 830 b may be installed in the second base 32. Thebearing 830 a, 830 b may support both sides of the lead screw 840. Thebearing 830 a, 830 b may include an inner bearing 830 b located close tothe motor assembly 810 and an outer bearing 830 a located far from themotor assembly 810. The lead screw 840 may be stably rotated by thebearing 830 a, 830 b.

The slide 820 may be engaged with the lead screw 840. The slide 820 maymove forward or rearward in the longitudinal direction of the lead screw840 according to the rotation of the lead screw 840. The slide 820 maymove between the outer bearing 830 a and the inner bearing 830 b. Theslide 820 may be located in the left lead screw 840 and the right leadscrew 840, respectively. The left slide 820 may be engaged with the leftlead screw 840. The right slide 820 may be engaged with the right leadscrew 840.

The left slide 820 and the right slide 820 may be located symmetricallywith respect to the motor assembly 810. Due to the driving of the motorassembly 810, the left slide 820 and the right slide 820 may move faraway or approach from each other by the same distance.

Referring to FIG. 23 , the motor assembly 810 may include a plate 813.The plate 813 may be referred to as a mount plate 813 or a motor mountplate 813. A coupling portion 32 h may be formed in an upper surface ofsecond base 32. The plate 813 may be fastened to the coupling portion 32h through a screw S. The motor assembly 810 may be spaced apart from thetop surface of the second base 32. A washer 813 may be located betweenthe top surface of the plate 813 and the screw S. The washer 813 mayinclude a rubber material. The washer 813 may reduce vibration generatedin the motor assembly 810. The washer 813 may improve driving stabilityof the display device 100.

Referring to FIG. 24 , a guide rail 860 may be installed in the secondbase 32. The guide rail 860 may be located in parallel with the leadscrew 840. The slide 820 may be engaged with the guide rail 860. A firststopper 861 b may be located in one side of the guide rail 860, and asecond stopper 861 a may be located in the other side of the guide rail860. The range in which the slide 820 can move may be limited to betweenthe first stopper 861 b and the second stopper 861 a.

A spring 850 may wrap the lead screw 840. The lead screw 840 maypenetrate the spring 850. The spring 850 may be located between theinner bearing 830 b and the slide 820. One side of the spring 850 maycontact the inner bearing 830 b, and the other side of the spring 850may contact the slide 820. The spring 850 may provide an elastic forceto the slide 820.

When the slide 820 is caught in the first stopper 861 b, the spring 850may be maximally compressed. When the slide 820 is caught in the firststopper 861 b, the length of the spring 850 may be minimized. When theslide 820 is caught in the first stopper 861 b, the distance between theslide 820 and the inner bearing 830 b may be minimized.

Referring to FIG. 25 , when the slide 820 is caught in the secondstopper 861 a, the spring 850 may be maximally tensioned. When the slide820 is caught in the second stopper 861 b, the length of the spring 850may be maximized. When the slide 820 is caught in the second stopper 861a, the distance between the slide 820 and the inner bearing 830 b may bemaximized.

Referring to FIG. 26 , the first part 820 a may be engaged with theguide rail 860. The first part 820 a may move along the guide rail 860.Movement of the first part 820 a in the longitudinal direction of theguide rail 860 may be restricted. The second part 820 b may be locatedabove the first part 820 a. The first part 820 a and the second part 820b may be fastened through a screw. The second part 820 b may be spacedapart from the guide rail 860. The lead screw 840 may penetrate thesecond part 820 b. For example, the second part 820 b may include a malethread that engages with a female thread of the lead screw 840.Accordingly, even if the lead screw 840 is rotated, the slide 820 can bestably moved forward or rearward along the guide rail 860 withoutrotating.

The third part 820 c may be coupled to one side of the second part 820b. The third part 820 c may contact the spring 850. The third part 820 cmay be provided with an elastic force from the spring 850.

Referring to FIGS. 27 and 28 , a link mount 920 may be installed in thesecond base 32. One side of a second arm 912 may be pivotably connectedto a link mount 920. The other side of the second arm 912 may bepivotably connected to a joint 913. The other side of the second arm 912may be pivotably connected to a second axis 913 b. One side of a rod 870may be pivotably connected to the slide 820. The other side of the rod870 may be pivotably connected to the second arm 912 or a third arm 915.One side of the third arm 915 may be pivotably connected to the linkmount 920. The other side of the third arm 915 may be pivotablyconnected to the other side of the rod 870. The link mount 920 mayinclude a shaft 921. The second arm 912 or the third arm 915 may bepivotably connected to the shaft 921.

A link bracket 951 may be referred to as a link cap 951. The linkbracket 951 may be coupled to a top case 950. The top case 950 may bereferred to as a case top 950, an upper bar 950, a top 950, or a bar950. The top case 950 may be located in an upper end of the display unit20. The display unit 20 may be fixed to the top case 950.

One side of a first arm 911 may be pivotably connected to the joint 913.One side of the first arm 911 may be pivotably connected to a firstshaft 913 a. The other side of the first arm 911 may be pivotablyconnected to the link bracket 951 or the top case 950.

A gear g1 may be formed in one side of the first arm 911. A gear g2 maybe formed in the other side of the second arm 912. The gear g1 of thefirst arm 911 and the gear g2 of the second arm 912 may be engaged witheach other.

When the slide 820 approaches the outer bearing 830 a, the second arm912 or the third arm 915 may stand up. At this time, the direction inwhich the second arm 912 or the third arm 915 stands may be referred toas a standing direction DRS.

The second arm 912 may include a protrusion 914 protruding in thestanding direction DRS. The protrusion 914 may be referred to as aconnection part 914. The third arm 915 may include a protrusion 916protruding in the standing direction DRS. The protrusion 916 may bereferred to as a connection part 916. The protrusion 914 of the secondarm 912 and the protrusion 916 of the third arm 915 may face or contacteach other. The other side of the rod 870 may be fastened to theprotrusion 914 of the second arm 912 or the protrusion 916 of the thirdarm 915.

A link 910 may include a first arm 911, a second arm 912, a third arm915, and/or a joint 913.

Referring to FIGS. 29 and 30 , an angle formed by the second arm 912 orthe third arm 915 with respect to the second base 32 may be referred toas theta S. When the rod 870 is connected to the upper side of thesecond part 820 b, an angle between the rod 870 and the second base 32may be referred to as theta A, and the minimum force for the rod 870 tostand the second arm 912 or the third arm 915 may be referred to as Fa.When the rod 870 is connected to the middle of the second part 820 b, anangle between the rod 870 and the second base 32 may be referred to astheta B, and the minimum force for the rod 870 to stand the second arm912 or the third arm 915 may be referred to as Fb. When the rod 870 isconnected to the lower side of the second part 820 b, an angle betweenthe rod 870 and the second base 32 may be referred to as theta C, andthe minimum force for the rod 870 to stand the second arm 912 or thethird arm 915 may be referred to as Fc.

A relationship of theta A<theta B<theta C can be established for thesame theta S. In addition, a relationship of Fc<Fb<Fa may be establishedfor the same theta S. If an angle formed by the second arm 912 or thethird arm 915 with respect to the second base 32 is the same, the forcerequired to stand up the second arm 912 or the third arm 915 can becomesmaller as the angle formed by the rod 870 and the second base 32increases. The rod 870 may be connected to the lower side of the secondpart 820 b to reduce the load applied on the motor assembly 810.

Referring to FIG. 31 , the rod 870′ may not be connected to theprotrusion of the second arm 912 or the protrusion of the third arm915′. When the angle formed by the second arm 912′ or the third arm 915′with respect to the second base 32 is theta S, the angle formed by therod 870′ and the second base 32 is referred to as theta 1, and theminimum force for the rod 870′ to stand up the second arm 912′ or thethird arm 915′ may be referred to as F1.

Referring to FIG. 32 , the rod 870 may be connected to the protrusion914 of the second arm 912 or the protrusion 916 of the third arm 915.When the angle formed by the second arm 912 or the third arm 915 withrespect to the second base 32 is theta S, the angle formed by the rod870 and the second base 32 may be referred to as theta 2, and theminimum force for the rod 870 to stand the second arm 912 or the thirdarm 915 may be referred to as F2.

Referring to FIG. 33 , when theta S is the same, theta 2 may be greaterthan theta 1. If Theta S is the same, F1 can be greater than F2. If theangle formed by the second arm 912, 912′ and the second base 32 is thesame, the force required to stand up the second arm 912, 912′ may becomesmaller as the angle formed by the rod 870, 870′ and the second base 32becomes larger. The rod 870 may be connected to the protrusion 914, 916to stand up the second arm 912 with less force than a case where the rod870′ is not connected to the protrusion. The rod 870 may be connected tothe 914, 916 to reduce the load applied on the motor assembly 810.

Referring to FIG. 34 , the second arm 912 or the third arm 915 may havea central axis CR. When the rod 870 is fastened to the second arm 912 bya distance r away from the central axis CR, the angle formed by the rod870 and the second base 32 may be referred to as theta 2, and theminimum force for the 870 to stand the second arm 912 or the third arm915 may be referred to as F3. When the rod 870 is fastened to the secondarm 912 by a distance r′ away from the central axis CR, the angle formedby the rod 870 and the second base 32 may be referred to as theta 2′,and the minimum force for the rod 870 to stand the second arm 912 or thethird arm 915 may be referred to as F4. When the rod 870 is fastened tothe second arm 912 by a distance r″ away from the central axis CR, theangle formed by the rod 870 and the second base 32 may be referred to astheta 2″, and the minimum force for the rod 870 to stand the second arm912 or the third arm 915 may be referred to as F5.

Referring to FIG. 35 , when theta S is the same, theta 2″ may be greaterthan theta 2′, and theta 2′ may be greater than theta 2. When theta S isthe same, F3 may be greater than F4, and F4 may be greater than F5. Asthe rod 870 is fastened away from the central axis CR, the forcerequired to stand the second arm 912 may be smaller. Since the rod 870is fastened away from the central axis CR, the load on the motorassembly 810 may be reduced.

Referring to FIG. 36 , the first arm 911 and the second arm 912 may bein contact with or close to the rear surface of the display unit 20.Since the first arm 911 and the second arm 912 are in contact with orclose to the rear surface of the display unit 20, the display unit 20may be stably wound around or unwound from a roller. The link mount 920may include a first part 922 and a second part 923. The first part 922and the second part 923 may face each other. A space S4 may be formedbetween the first part 922 and the second part 923. The first part 922may face the display unit 20. The first part 922 may be located closerto the display unit 20 than the second part 923. The second arm 912 maybe pivotably connected to the front surface of the first part 922. Apart of the third arm 915 may be accommodated in the space S4 andpivotably connected to the first part 922 or the second part 923.

Referring to FIG. 37 , the rod 870 may include a first part 871 and asecond part 872. The first part 871 may include a connection part 871 ain one side thereof. The second part 872 of the slide 820 may form aspace S5 therein. The connection part 871 a may be inserted into thespace S5. The connection part 871 a may be pivotably connected to thesecond part 820 b (see FIG. 36 ) of the slide 820. The other side of thefirst part 871 may be connected to one side of the second part 872. Theother side of the second part 872 may be pivotably connected to thesecond arm 912 or the third arm 915. The first part 871 may form a spaceS3 therein. The first part 871 may include a hole 871 b. The lead screw840 may be accommodated in the hole 871 b or the space S3.

The distance between the second part 872 and the display unit 20 may beD1. The second arm 912 may have a thickness W1. A portion of the thirdarm 915 accommodated in the space S4 may have a thickness W3. Thethickness W3 may be equal to the distance between the first part 922 andthe second part 923. A portion of the third arm 915 that is notaccommodated in the space S4 may have a thickness W2. The first part 922may have a thickness W4. The thickness W2 may be greater than thethickness W3. The thickness W2 may be equal to the sum of the thicknessW3 and the thickness W4. D1 may be the sum of the thickness W1 and thethickness W2.

The second arm 912 may be located in contact with or close to the rearsurface of the display unit 20, and the third arm 915 may be locatedbetween the second arm 912 and the second part 872. The second part 872can stably transmit power for standing the second arm 912 due to thethird arm 915. The second part 872 may be connected to the first part871 by moving forward with respect to the axis of rotation of the leadscrew 840, so as to stably stand the second arm 912 or the third arm915. Thus, the play between the second arm 912 and the second part 872may be minimized.

Referring to FIG. 38 , a pusher 930 may be installed in the link mount920. The pusher 930 may be referred to as a lifter 930. A second part932 may be fastened to the first part 931. The second part 932 may be incontact with or separated from the link bracket 951. The second part 932may be made of a material having high elasticity. The first part 931 maybe made of a material having a lower elasticity than the second part932. The first part 931 may be made of a material having a higherrigidity than the second part 932. The first part 931 and the secondpart 932 may be collectively referred to as a head 936. The head 936 maybe located above the link mount 920.

A third part 933 may be connected to the first part 931. Alternatively,the third part 933 may be extended downward from the first part 931. Thethird part 933 may be referred to as a tail 933. A fourth part 934 mayprotrude from the third part 933. The link mount 920 may form a spaceS6, and the third part 933 may be accommodated in the space S6. Thespace S6 may be opened upward. The space S6 in which the third part 933is accommodated may be adjacent to the space S4 (see FIG. 37 ) in whichthe third arm 915 is accommodated. The second part 932 of the link mount920 may include a hole 924. The hole 924 may be a long hole formed inthe vertical direction. The length of the hole 924 may be H1. The fourthpart 934 may be inserted into the hole 924. The spring 935 may beaccommodated in the space S6. The spring 935 may be located below thethird part 933. The spring 935 may provide an elastic force in thedirection perpendicular to the third part 933.

The head 936 may be larger than the diameter of the space S6. When thehead 936 is caught in the upper end of the space S6, the height of thehead 936 from the second base 32 may be minimized. The minimum height ofthe head 936 may be referred to as H2. When the height of the head 936is minimized, the fourth part 934 may be caught in the lower end of thespace S6. When the height of the head 936 is minimized, the spring 935may be maximally compressed. When the height of the head 936 isminimized, the elastic force provided by the spring 935 may bemaximized. When the height of the head 936 is minimized, the height ofthe top case 950 may be maximized.

The pusher 930 may provide elastic force to the link bracket 951, whilebeing in contact with the link bracket 951. Thus, the load applied onthe motor assembly 810 to stand up the link 910 may be reduced.

Referring to FIG. 39 , when the link 910 stands up sufficiently, thepusher 930 may be separated from the link bracket 951. When the pusher930 is separated from the link bracket 951, the height of the head 936from the second base 32 may be maximized. The maximum height of the head936 may be referred to as H3. When the height of the head 936 ismaximized, the fourth part 934 may be caught in the upper end of thehole 924 (see FIG. 38 ). If the height of the head 936 is maximized, thespring 935 may be maximally tensioned. When the height of the head 936is maximized, the elastic force provided by the spring 935 may beminimized. The maximum height H3 of the head 936 may be substantiallyequal to the sum of the minimum height H2 of the head 936 and the lengthH1 of the hole.

Referring to FIG. 40 , the display unit 20 may be in a state of beingmaximally wound around the roller 143. The display device 100 may besymmetrical with respect to the motor assembly 810. The height of thetop case 950 may be minimized. The slide 820 may be in a positionclosest to the inner bearing 830 b. The slide 820 may be in a state ofbeing caught in the first stopper 861 b. The spring 850 may be in amaximally compressed state. The pusher 930 may be in contact with thelink bracket 951. The height of the pusher 930 may be minimized.

Referring to FIG. 41 , about half of the display unit 20 may be in astate of being wound around the roller 143. The display device 100 maybe symmetrical with respect to the motor assembly 810. About half of thedisplay unit 20 may be in a state of being unwound from the roller 143.The slide 820 may be located between the first stopper 861 b and thesecond stopper 861 a. The pusher 930 may be separated from the linkbracket 951. The height of the pusher 930 may be maximized.

Referring to FIG. 42 , the display unit 20 may be in a state of beingmaximally unwound from the roller 143. The display device 100 may besymmetrical with respect to the motor assembly 810. The height of thetop case 950 may be maximized. The slide 820 may be in a positionclosest to the outer bearing 830 a. The slide 820 may be in a state ofbeing caught in the second stopper 861 a. The spring 850 may be in astate of maximum tension. The pusher 930 may be separated from the linkbracket 951. The height of the pusher 930 may be maximized.

Referring to FIGS. 43 to 46 , a link mount 920 a, 920 b may be installedin the base 31. The link mount 920 a, 920 b may include a right linkmount 920 a spaced to the right from a first right bearing 830 a and aleft link mount 920 b spaced to the left from a second left bearing 830d.

A link 910 a, 910 b may be connected to the link mount 920 a, 920 b. Thelink 910 a, 910 b may include a right link 910 a connected to the rightlink mount 920 a and a left link 910 b connected to the left link mount920 b.

The right link 910 a may be referred to as a first link. The left link910 b may be referred to as a second link. The right link mount 920 amay be referred to as a first link mount 920 a. The left link mount 920b may be referred to as a second link mount 920 b.

The link 910 a, 910 b may include a first arm 911 a, 911 b, a second arm912 a, 912 b, and an arm joint 913 a, 913 b. One side of the second arm912 a, 912 b may be rotatably connected to the link mount 920 a, 920 b.The other side of the second arm 912 a, 912 b may be rotatably connectedto the arm joint 913 a, 913 b. One side of the first arm 911 a, 911 bmay be rotatably connected to the arm joint 913 a, 913 b. The other sideof the first arm 911 a, 911 b may be rotatably connected to the linkbracket 951 a, 951 b.

The link bracket 951 a, 951 b may include a right link bracket 951 aconnected to the first arm 911 a of the right link 910 a and a left linkbracket 951 b connected to the first arm 911 b of the left link 910 b.The link bracket 951 a, 951 b may be connected to the upper bar 950.

The upper bar 950 may connect the right link bracket 951 a and the leftlink bracket 951 b.

A rod 870 a, 870 b may connect a slider 860 a, 860 b to the link 910 a,910 b. One side of the rod 870 a, 870 b may be rotatably connected tothe slider 860 a, 860 b. The other side of the rod 870 a, 870 b may berotatably connected to the second arm 912 a, 912 b. The rod 870 a, 870 bmay include a right rod 870 a connecting the right slider 860 a and thesecond arm 912 a of the right link 910 a and a left rod 870 b connectingthe left slider 860 b and the second arm 912 b of the left link 910 b.The right rod 870 a may be referred to as a first rod 870 a. The leftrod 870 b may be referred to as a second rod 870 b.

Specifically, a structure formed by a right lead screw 840 a, the rightslider 860 a, the right rod 870 a, and the right link 910 a will bedescribed. The right slider 860 a may include a body 861 a and a rodmount 862 a. The body 861 a may have a thread SS formed on an innercircumferential surface thereof. The thread formed in the body 861 a maybe engaged with the thread RS of the right lead screw 840 a. The rightlead screw 840 a may penetrate the body 861 a.

The rod mount 862 a may be formed in the right side of the body 861 a.The rod mount 862 a may be rotatably connected to one side of the rightrod 870 a. The rod mount 862 a may include a first rod mount 862 a 1 anda second rod mount 862 a 2. The first rod mount 862 a 1 may be disposedin front of the right lead screw 840 a. The second rod mount 862 a 2 maybe disposed behind the right lead screw 840 a. The first rod mount 862 a1 and the second rod mount 862 a 2 may be spaced apart from each other.The second rod mount 862 a 2 may be spaced apart from the first rodmount 862 a 1 in the −z axis direction. The right lead screw 840 a maybe located between the first rod mount 862 a 1 and the second rod mount862 a 2.

The rod mount 862 a may be rotatably connected to one side of the rod870 a through a connecting member C1. The connecting member C1 maypenetrate the rod mount 862 a and the right rod 870 a.

The right rod 870 a may be rotatably connected to a second arm 912 athrough a connecting member C2. The connecting member C2 may penetratethe second arm 912 a and the right rod 870 a.

The right rod 870 a may include a transmission part 871 a connected tothe second arm 912 a of the right link 910 a and a cover 872 a connectedto the rod mount 862 a of the right slider 860 a. The transmission part871 a may transmit a force, which is generated as the right slider 860 amoves forward or rearward along the right lead screw 840 a, to the rightlink 910 a.

The cover 872 a may include a first plate 873 a disposed in front of theright lead screw 840 a. The first plate 873 a may be disposedperpendicular to the base 31. Alternatively, the first plate 873 a mayface the right lead screw 840 a.

The cover 872 a may include a second plate 874 a disposed behind theright lead screw 840 a. The second plate 874 a may be disposedperpendicular to the base 31. Alternatively, the second plate 874 a mayface the right lead screw 840 a. Alternatively, the second plate 874 amay be spaced apart from the first plate 873 a. The right lead screw 840a may be located between the first plate 873 a and the second plate 874a.

The cover 872 a may include a third plate 875 a connecting the firstplate 873 a and the second plate 874 a. The third plate 875 a may beconnected to the transmission part. The third plate 875 a may be locatedabove the right lead screw 840 a.

The cover 872 a may include a fourth plate 876 a connecting the firstplate 873 a and the second plate 874 a. The fourth plate 876 a may beconnected to the third plate 875 a. The fourth plate 876 a may belocated above the right lead screw 840 a.

One side of the first plate 873 a may be connected to the first rodmount 862 a 1. The first plate 873 a and the first rod mount 862 a 1 maybe connected through the connecting member Cr. The other side of thefirst plate 873 a may be connected to the third plate 875 a.

One side of the second plate 874 a may be connected to the second rodmount 862 a 2. The second plate 874 a and the second rod mount 862 a 2may be connected through the connecting member C1. The other side of thesecond plate 874 a may be connected to the third plate 875 a.

When the right slider 860 a is moved closer to the motor assembly 810,the right lead screw 840 a and the right rod 870 a may be in contactwith each other. When the right lead screw 840 a and the right rod 870 acontact each other, mutual interference may occur and the movement ofthe right slider 860 a may be restricted.

The cover 872 a may provide a space S1 therein. The first plate 873 a,the second plate 874 a, the third plate 875 a, and the fourth plate 876a may form the space S1. When the right slider 860 a is moved closer tothe motor assembly 810, the right lead screw 840 a may be accommodatedor escaped into the space S1 provided by the cover 872 a. The rightslider 860 a may move closer to the motor assembly 810 than a case ofnot having the cover 872 a, due to the space S1 provided by the cover872 a. That is, the cover 872 a may expand the movable range of theright slider 860 a by providing the space S1 therein. In addition, sincethe right lead screw 840 a is accommodated in the cover 872 a, the sizeof the housing 30 (see FIG. 2 ) can be reduced.

In addition, the cover 872 a may limit the minimum value of the angletheta S formed between the second arm 912 a and the base 31. The thirdplate 875 a of the cover 872 a may contact the second arm 912 a and maysupport the second arm 912 a, when theta S is sufficiently small. Bysupporting the second arm 912 a, the third plate 875 a may limit theminimum value of theta S and prevent sagging of the second arm 912 a.That is, the cover 872 a may serve as a stopper for preventing saggingof the second arm 912 a. In addition, the third plate 875 a may reducethe initial load for standing the second arm 912 a by limiting theminimum value of theta S.

The lead screw 840 a, 840 b may be driven by a single motor assembly810. The lead screw 840 a, 840 b is driven by a single motor assembly810, so that the second arm 912 a, 912 b can stand up in symmetry.However, when driving the lead screw 840 a, 840 b by a single motorassembly 810, the load on the motor assembly 810 to stand the second arm912 a, 912 b may be excessively increased. At this time, the third plate875 a may reduce the load on the motor assembly 810 to stand the secondarm 912 a, 912 b, by limiting the minimum value of theta S.

The structure formed by the left lead screw 840 b, the left slider 860b, the left rod 870 b, and the left link 910 b may be symmetric with thestructure formed by the right lead screw 840 a, the right slider 860 a,the right rod 870 a, and the right link 910 a. In this case, the axis ofsymmetry may be the axis of symmetry ys of the motor assembly 810.

Referring to FIG. 47 , a guide 850 a, 850 b, 850 c, 850 d may beconnected to the bearing 830 a, 830 b, 830 c, and 830 d. The guide 850a, 850 b, 850 c, 850 d may include a right guide 850 a, 850 b disposedin the right side of the motor assembly 810 and a left guide 850 c, 850d disposed in the left side of the motor assembly 810.

The right guide 850 a, 850 b may have one side connected to a firstright bearing 830 a and the other side connected to a second rightbearing 830 b. The right guide 850 a, 850 b may be located in parallelwith the right lead screw 840 a. Alternatively, the right guide 850 a,850 b may be spaced apart from the right lead screw 840 a.

The right guide 850 a, 850 b may include a first right guide 850 a and asecond right guide 850 b. The first right guide 850 a and the secondright guide 850 b may be spaced apart from each other. The right leadscrew 840 a may be located between the first right guide 850 a and thesecond right guide 850 b.

The right slider 860 a may include a protrusion. Alternatively, thedisplay device may include a protrusion formed in the right slider 860a. The protrusion may be formed in the body of the slider. Theprotrusion may include a front protrusion (not shown) protruded in the+z-axis direction from the body 861 a of the right slider 860 a and arear protrusion 865 a protruded in the −z-axis direction from the bodyof the slider.

The first right guide 850 a may penetrate the rear protrusion 865 a.Alternatively, it may include a first hole 863 a formed in the rearprotrusion, and the first right guide 850 a may penetrate the first hole863 a. The first hole 863 a may be formed in the x-axis direction. Thefirst hole 863 a may be referred to as a hole 863 a.

The second right guide (not shown) may penetrate the front protrusion(not shown). Alternatively, it may include a second hole (not shown)formed in the front protrusion, and the second right guide may penetratethe second hole. The second hole may be formed in the x-axis direction.

The right guide 850 a, 850 b may guide the right slider 860 a to movemore stably when the right slider 860 a moves forward or rearward alongthe right lead screw 840 a. As the right guide 850 a, 850 b stablyguides the right slider 860 a, the right slider 860 a can move forwardor rearward along the right lead screw 840 a while not rotating withrespect to the right lead screw 840 a.

The structure formed by the left guide 850 c, 850 d, the left bearing830 a, 830 b, 830 c, and 830 d, the left slider 860 b, and the left leadscrew 840 b may be symmetrical with the structure formed by the rightguide 850 a, 850 b, the right bearing 830 a, 830 b, 830 c, and 830 d,the right slider 860 a, and the right lead screw 840 a. In this case,the axis of symmetry may be the axis of symmetry ys of the motorassembly 810.

Referring to FIG. 48 , a first spring 841 a, 841 b may be inserted intothe lead screw 840 a, 840 b. Alternatively, the lead screw 840 a, 840 bmay penetrate the first spring 841 a, 841 b. The first spring 841 a, 841b may include a first right spring 841 a disposed in the right side ofthe motor assembly 810 and a first left spring 841 b disposed in theleft side of the motor assembly 810.

The first right spring 841 a may be disposed between the right slider860 a and the second right bearing 830 b. One end of the first rightspring 841 a may be in contact with or separated from the right slider860 a. The other end of the first right spring 841 a may be in contactwith or separated from the second right bearing 830 b.

When the second arm 912 a is fully laid with respect to the base 31, thedistance between the right slider 860 a and the second right bearing 830b may be a distance RD3. The first right spring 841 a may have a lengthgreater than the distance RD3 in the state of not being compressed ortensioned. Thus, when the second arm 912 a is fully laid with respect tothe base 31, the first right spring 841 a may be compressed between theright slider 860 a and the second right bearing 830 b. Then, the firstright spring 841 a may provide a restoring force to the right slider 860a in the +x axis direction.

When the second arm 912 a changes from a fully laid state to a standingstate with respect to the base 31, the restoring force provided by thefirst right spring 841 a may assist the second arm 912 a to stand up. Asthe first right spring 841 a assists the second arm 912 a to stand up,the load on the motor assembly 810 may be reduced.

The lead screw 840 a, 840 b may be driven by a single motor assembly810. As the lead screw 840 a, 840 b is driven by a single motor assembly810, the second arm 912 a, 912 b can stand up in symmetry. However, whenthe lead screw 840 a, 840 b is driven by a single motor assembly 810,the load on the motor assembly 810 to stand the second arm 912 a, 912 bmay be excessively increased. At this time, the first right spring 841 aassists the second arm 912 a to stand up, so that the load on the motorassembly 810 can be decreased, and the load on the motor assembly 810 tostand the second arm 912 a can be reduced.

Alternatively, when the second arm 912 a changes from the standing stateto the fully laid state with respect to the base 31, the restoring forceprovided by the first right spring 841 a can alleviate the shock thatoccurs when the second arm 912 a is laid with respect to the base 31.That is, the first right spring 841 a may serve as a damper when thesecond arm 912 a is laid with respect to the base 31. As the first rightspring 841 a serves as a damper, the load of the motor assembly 810 maybe reduced.

The structure formed by the first left spring 841 b, the left bearing830 a, 830 b, 830 c, and 830 d, the left slider 860 b, the left leadscrew 840 b, and the second arm 912 a may be symmetrical with thestructure formed by the first right spring 841 a, the right bearing 830a, 830 b, 830 c, and 830 d, the right slider 860 a, the right lead screw840 a, and the second arm 912 a. In this case, the axis of symmetry maybe the axis of symmetry ys of the motor assembly 810.

Referring to FIG. 49 , the second spring 851 a, 851 b may be insertedinto the guide 850 a, 850 b, 850 c, 850 d. Alternatively, the guide 850a, 850 b, 850 c, 850 d may penetrate the second spring 851 a, 851 b. Thesecond spring 851 a, 851 b may include a second right spring 851 adisposed in the right side of the motor assembly 810 and a second leftspring 851 b disposed in the left side of the motor assembly 810.

A plurality of second right springs 851 a may be formed. The secondright spring 851 a may include a spring 940 a, 940 b inserted into thefirst right guide 850 a and a spring 940 a, 940 b inserted into thesecond right guide 850 b. Alternatively, the second right spring 851 amay include a spring 940 a, 940 b through which the first right guide850 a passes and a spring 940 a, 940 b through which the second rightguide 850 b passes.

The guide 850 a, 850 b, 850 c, 850 d may include a locking jaw 852 a,852 b. The locking jaw 852 a, 852 b may include a right locking jaw 852a disposed in the right side of the motor assembly 810 and a leftlocking jaw 852 b disposed in the left side of the motor assembly 810.

The right locking jaw 852 a may be disposed between the right slider 860a and the second right bearing 830 b. The second right spring 851 a maybe disposed between the right slider 860 a and the second right bearing830 b. One end of the second right spring 851 a may be in contact withor separated from the right slider 860 a. The other end of the secondright spring 851 a may be in contact with or separated from the rightlocking jaw 852 a.

When the second arm 912 a is fully laid with respect to the base 31, thedistance between the right slider 860 a and the right locking jaw 852 amay be a distance RD4. The second right spring 851 a may have a lengthgreater than the distance RD4 in the state of being not compressed ortensioned. Thus, when the second arm 912 a is fully laid with respect tothe base 31, the second right spring 851 a may be compressed between theright slider 860 a and the right locking jaw 852 a. The second rightspring 851 a may provide a restoring force to the right slider 860 a inthe +x axis direction.

When the second arm 912 a changes from the fully laid state to thestanding state with respect to the base 31, the restoring force providedby the second right spring 851 a may assist the second arm 912 a tostand up. As the second right spring 851 a assists the second arm 912 ato stand, the load on the motor assembly 810 can be reduced.

The lead screw 840 a, 840 b may be driven by a single motor assembly810. As the lead screw 840 a, 840 b is driven by a single motor assembly810, the second arm 912 a, 912 b may stand up in symmetry. However, whenthe lead screw 840 a, 840 b is driven by a single motor assembly 810,the load on the motor assembly 810 to stand the second arm 912 a, 912 bmay be excessively increased. At this time, the second right spring 851a may assist the second arm 912 a to stand up so that the load on themotor assembly 810 can be decreased, thereby reducing the load on themotor assembly 810 to stand the second arm 912 a.

Alternatively, when the second arm 912 a changes from the standing stateto the fully laid state with respect to the base 31, the restoring forceprovided by the second right spring 851 a can alleviate the shock thatoccurs when the second arm 912 a is laid with respect to the base 31.That is, the second right spring 851 a may serve as a damper when thesecond arm 912 a is laid with respect to the base 31. As the secondright spring 851 a serves as a damper, the load of the motor assembly810 may be reduced.

The structure formed by the second left spring 851 b, the left lockingjaw 852 b, the left slider 860 b, the left guide 850 c, 850 d, and thesecond arm 912 a may be symmetric with the structure formed by theabove-described second right spring 851 a, the right locking jaw 852 a,the right slider 860 a, the right guide 850 a, 850 b, and the second arm912 a. In this case, the axis of symmetry may be the axis of symmetry ysof the motor assembly 810.

Referring to FIGS. 50 to 52 , the second arm 912 a may stand up byreceiving a restoring force from the first right spring 841 a and thesecond right spring 851 a.

An angle formed by the second arm 912 a with respect to the base 31 maybe referred to as an angle theta S. The angle formed by the right rod870 a with respect to the base 31 may be referred to as an angle thetaT. The force applied by the motor assembly 810 for moving the rightslider 860 a in the +x-axis direction may be referred to as FA. Theforce exerted on the right slider 860 a by the first right spring 841 amay be referred to as FB. The force exerted on the right slider 860 a bythe second right spring 851 a may be referred to as FC. The forcetransmitted by the right rod 870 a to the second arm 912 a may bereferred to as FT.

When the second arm 912 a is fully laid with respect to the base 31, theangle theta S and the angle theta T may have minimum values. When thesecond arm 912 a changes from the fully laid state to the standing statewith respect to the second base 31, the angle theta S and the angletheta T may be gradually increased.

When the second arm 912 a is fully laid with respect to the base 31, thefirst right spring 841 a may be compressed. The compressed first rightspring 841 a may provide restoring force FB to the right slider 860 a.The restoring force FB may act in the +x direction. When the second arm912 a is fully laid with respect to the base 31, the compressiondisplacement amount of the first right spring 841 a may be maximized,and the magnitude of the restoring force FB may have a maximum value.When the second arm 912 a changes from the fully laid state to thestanding state with respect to the base 31, the compression displacementamount of the first right spring 841 a may be gradually decreased, andthe magnitude of the restoring force FB may be gradually decreased.

When the second arm 912 a is fully laid with respect to the base 31, thesecond right spring 851 a may be compressed. The compressed second rightspring 851 a may provide restoring force FC to the right slider 860 a.The restoring force FC may act in the +x direction. When the second arm912 a is fully laid with respect to the base 31, the compressiondisplacement amount of the second right spring 851 a may be maximized,and the magnitude of the restoring force FC may have a maximum value.When the second arm 912 a changes from the fully laid state to thestanding state with respect to the base 31, the compression displacementamount of the second right spring 851 a may be gradually decreased, andthe magnitude of the restoring force FC may be gradually decreased.

The force FT that the right rod 870 a transmits to the second arm 912 amay be a summed force of the force FA applied by the motor assembly 810for moving the right slider 860 a in the +x-axis direction, therestoring force FB of the first right spring 841 a, and the restoringforce FC of the second right spring 851 a.

When the second arm 912 a starts to stand up in the state where thesecond arm 912 a is fully laid with respect to the base 31, the load ofthe motor assembly 810 may be maximized. At this time, the magnitude ofthe restoring force FB provided by the first right spring 841 a may bemaximized. In addition, the magnitude of the restoring force FC providedby the second spring 851 a, 851 b may be maximized.

When the second arm 912 a changes from the fully laid state to thestanding state with respect to the base 31, the restoring force providedby the first right spring 841 a and the second right spring 851 a mayassist to stand the second arm 912 a. As the first right spring 841 aand the second right spring 851 a assist the second arm 912 a to stand,the load of the motor assembly 810 can be reduced.

The first right spring 841 a and the second right spring 851 a maysimultaneously provide the restoring force (the summed force of therestoring force FB and the restoring force FC) to the right slider 860a. The restoring force (the summed force of the restoring force FB andthe restoring force FC) may be provided to the right slider 860 a untilthe distance RD5 between the right slider 860 a and the right lockingjaw 852 a becomes equal to the length of the second right spring 851 a.

When the distance RD5 between the right slider 860 a and the rightlocking jaw 852 a is equal to the length of the second right spring 851a, the compression displacement amount of the second right spring 851 amay become zero. When the compression displacement amount of the secondright spring 851 a is zero, the restoring force FC provided by thesecond right spring 851 a to the right slider 860 a may be zero.

When the distance RD5 between the right slider 860 a and the rightlocking jaw 852 a is greater than the length of the second right spring851 a, only the first right spring 841 a may provide the restoring forceFB to the right slider 860 a. The restoring force FB may be provided tothe right slider 860 a until the distance RD6 between the right slider860 a and the second right bearing 830 b becomes equal to the length ofthe first right spring 841 a.

When the distance RD6 between the right slider 860 a and the secondright bearing 830 b is equal to the length of the first right spring 841a, the compression displacement amount of the first right spring 841 amay be zero. When the compression displacement amount of the first rightspring 841 a becomes zero, the restoring force FB provided by the firstright spring 841 a to the right slider 860 a may be zero.

When the distance RD6 between the right slider 860 a and the secondright bearing 830 b is greater than the length of the first right spring841 a, the motor assembly 810 may stand the second arm 912 a withoutreceiving the restoring force from the first right spring 841 a or thesecond right spring 851 a.

The structure formed by the first left spring 841 b, the second leftspring 851 b, the left locking jaw 852 b, the left slider 860 b, theleft guide 850 c, 850 d, the left lead screw 840 b, the left rod 870 b,and the second arm 912 a may be symmetrical with the structure formed bythe first right spring 841 a, the second right spring 851 a, the rightlocking jaw 852 a, the right slider 860 a, the right guide 850 a, 850 b,the right lead screw 840 a, the right rod 870 a, and the second arm 912a. In this case, the axis of symmetry may be the axis of symmetry ys ofthe motor assembly 810.

Referring to FIG. 53 , the pusher 930 a, 930 b may be connected to thelink mount 920 a, 920 b. The pusher 930 a, 930 b may include a rightpusher 930 a disposed in the right side of the motor assembly 810 and aleft pusher 930 b disposed in the left side of the motor assembly 810.

The link mount 920 a, 920 b may form an accommodation space A. Theaccommodation space A may accommodate the spring 940 a, 940 b and thepusher 930 a, 930 b. The spring 940 a, 940 b may include a right spring940 a disposed in the right side of the motor assembly 810 and a leftspring 940 b disposed in the left side of the motor assembly 810. Theaccommodation space A may be referred to as an internal space A.

The link mount 920 a, 920 b may include a first hole 922 a connectingthe accommodation space A and an external space (the first holecorresponding to 920 b is not shown). The first hole 922 a may be formedin the upper surface of the link mount 920 a, 920 b. The first hole 922a may be referred to as a hole 922 a.

The pusher 930 a, 930 b may be located perpendicular to the base 31.Alternatively, the pusher 930 a, 930 b may be disposed parallel to the yaxis. The spring 940 a, 940 b may be located perpendicular to the base31. Alternatively, the spring 940 a, 940 b may be disposed parallel tothey axis.

The pusher 930 a, 930 b may include a first part 931 a, 931 b and asecond part 932 a, 932 b. The second part 932 a, 932 b may be connectedto the lower side of the first part 931 a, 931 b. The lower end of thesecond part 932 a, 932 b may be connected to the spring 940 a, 940 b.All or part of the second part 932 a, 932 b may be accommodated in theaccommodation space A formed by the link mount 920 a, 920 b. The secondpart 932 a, 932 b may have a diameter equal to the diameter of the firsthole 922 a or may have a diameter smaller than the diameter of the firsthole 922 a. The second part 932 a, 932 b may penetrate the first hole922 a.

The first part 931 a, 931 b may be located outside the link mount 920 a,920 b. Alternatively, the first part 931 a, 931 b may be located outsidethe accommodation space A of the link mount 920 a, 920 b. The first part931 a, 931 b may have a diameter larger than the diameter of the firsthole 922 a.

The first part 931 a, 931 b may be in contact with or spaced apart fromthe link bracket 951 a, 951 b. For example, when the second arm 912 a,912 b is fully laid with respect to the base 31, the first part 931 a,931 b may be in contact with the link bracket 951 a, 951 b.Alternatively, when the second arm 912 a, 912 b fully stands up withrespect to the base 31, the first part 931 a, 931 b may be spaced apartfrom the link bracket 951 a, 951 b.

When the first part 931 a, 931 b is in contact with the link bracket 951a, 951 b, the pusher 930 a, 930 b may receive a force from the linkbracket 951 a, 951 b. The force applied to the pusher 930 a, 930 b maybe in a downward direction. Alternatively, the force applied to thepusher 930 a, 930 b may be in the −y axis direction. Alternatively, thelink bracket 951 a, 951 b may press the pusher 930 a, 930 b. Thedirection in which the link bracket 951 a, 951 b presses the pusher 930a, 930 b may be downward. Alternatively, the direction in which the linkbracket 951 a, 951 b presses the pusher 930 a, 930 b may be in the −yaxis direction.

When the first part 931 a, 931 b is applied with a force, the spring 940a, 940 b may be compressed. The compressed spring 940 a, 940 b mayprovide restoring force to the pusher 930 a, 930 b. The direction of therestoring force may be opposite to the direction of the force applied tothe first part 931 a, 931 b. Alternatively, the restoring force may actin the +y-axis direction.

The link mount 920 a, 920 b may include a second hole 921 a (the secondhole corresponding to 920 b is not shown). The second hole 921 a mayconnect the accommodation space A and the external space. All or part ofthe spring 940 a, 940 b may be exposed to the outside through the secondhole 921 a. All or part of the pusher 930 a, 930 b may be exposed to theoutside through the second hole 921 a. In the maintenance or repair ofthe display device, a service provider may check the operating state ofthe pusher 930 a, 930 b through the second hole 921 a. The second hole921 a may provide a service provider with convenience of maintenance orrepair.

Referring to FIGS. 54 to 56 , the right link 910 a may stand up byreceiving the restoring force from the right pusher 930 a. It will bedescribed based on the right link 910 a.

An angle formed by the second arm 912 a with respect to the base 31 maybe referred to as an angle theta S. The force transmitted by the rightrod 870 a to the second arm 912 a may be referred to as FT. The forcetransmitted by the right pusher 930 a to the right link bracket 951 amay be referred to as FP.

Referring to FIG. 54 , when the second arm 912 a is fully laid withrespect to the base 31, the angle theta S may have a minimum value. Theright spring 940 a connected to the right pusher 930 a may be compressedmaximally, and the magnitude of the restoring force FP may have amaximum value. The compressed right spring 940 a may provide restoringforce FP to the right pusher 930 a. The right pusher 930 a may transmitthe restoring force FP to the right link bracket 951 a. The restoringforce FP can act in the +y-axis direction.

If the second arm 912 a is fully laid with respect to the base 31, thedistance HL from the base 31 to the upper end of the right pusher 930 amay have a minimum value. The first part 931 a of the right pusher 930 amay protrude to the outside of the right link mount 920 a, and thesecond part 932 a of the right pusher 930 a may be fully accommodated inthe accommodation space 923 a of the right link mount 920 a.

Referring to FIG. 55 , when the second arm 912 a changes from the fullylaid state to the standing state with respect to the base 31, the angletheta S may gradually increase. The compression displacement amount ofthe right spring 940 a may gradually decrease, and the magnitude of therestoring force FP may gradually decrease.

As the angle theta S gradually increases, at least a part of the secondpart 932 a of the right pusher 930 a may protrude to the outside of theright link mount 920 a. The length by which the second part 932 a of theright pusher 930 a protrudes to the outside of the right link mount 920a may be referred to as a length HP. The distance HL from the base 31 tothe upper end of the right pusher 930 a may increase by HP than a casewhere the second arm 912 a is fully laid with respect to the base 31.

Referring to FIG. 56 , when the second arm 912 a stands up with respectto the base 31, the right pusher 930 a and the right link bracket 951 amay be separated from each other. The compression displacement amount ofthe right spring 940 a may be zero. When the compression displacementamount of the right spring 940 a becomes zero, the restoring force FPprovided by the right pusher 930 a to the right link bracket 951 a maybe zero.

In addition, the length HP by which the second part 932 a of the rightpusher 930 a protrudes to the outside of the right link mount 920 a mayhave a maximum value. The distance HL from the base 31 to the upper endof the right pusher 930 a may have a maximum value.

That is, the right pusher 930 a may assist the second arm 912 a to standand reduce the load of the motor assembly 810 by applying a restoringforce to the right link bracket 951 a, while the right pusher 930 a andthe right link bracket 951 a are in contact with each other.

The lead screw 840 a, 840 b may be driven by a single motor assembly810. As the lead screw 840 a, 840 b is driven by a single motor assembly810, the second arm 912 a, 912 b can stand up in symmetry. However, whenthe lead screw 840 a, 840 b is driven by a single motor assembly 810,the load on the motor assembly 810 to stand the second arm 912 a, 912 bmay be excessively increased. At this time, the right pusher 930 a mayapply the restoring force to the right link bracket 951 a, therebyassisting the second arm 912 a to stand up and reducing the load of themotor assembly 810.

Alternatively, when the second arm 912 a changes from the standing stateto the fully laid state with respect to the base 31, the restoring forcethat the right pusher 930 a provides to the right link bracket 951 a canalleviate the shock that occurs when the link 910 a is laid with respectto the base 31. That is, the restoring force provided by the rightpusher 930 a to the right link bracket 951 a may serve as a damper whenthe link 910 a is laid with respect to the base 31. As the right pusher930 a serves as a damper, the load of the motor assembly 810 may bereduced.

The structure formed by the left pusher 930 b, the left spring 940 b,the left link bracket 951 b, the left link mount 920 b, and the left rod870 b may be symmetric with the structure formed by the right pusher 930a, the right spring 940 a, the right link bracket 951 a, the right link910 a mount, and the right rod 870 a. In this case, the axis of symmetrymay be the axis of symmetry of the motor assembly 810.

Referring to FIGS. 57 to 59 , the panel roller 143 may be installed inthe base 31. The panel roller 143 may be installed in front of the leadscrew 840 a, 840 b. Alternatively, the panel roller 143 may be disposedin parallel with the length direction of the lead screw 840 a, 840 b.Alternatively, the panel roller 143 may be spaced apart from the leadscrew 840 a, 840 b.

The display unit 20 may include a display panel 10 and a module cover15. The lower side of the display unit 20 may be connected to the panelroller 143, and the upper side of the display unit 20 may be connectedto the upper bar 75. The display unit 20 may be wound around or unwoundfrom the panel roller 143.

The distance from the axis of symmetry ys of the motor assembly 810 tothe right slider 860 a may be referred to as a distance RD. The distancefrom the axis of symmetry ys of the motor assembly 810 to the leftslider 860 b may be referred to as a distance LD. The distance betweenthe right slider 860 a and the left slider 860 b may be referred to as adistance SD. The distance SD may be the sum of the distance RD and thedistance LD. The distance from the base 31 to the upper end of thedisplay unit 20 may be referred to as a distance HD.

Referring to FIG. 57 , when the second arm 912 a, 912 b is fully laidwith respect to the base 31, the distance SD between the right slider860 a and the left slider 860 b may have a minimum value. The distanceRD from the axis of symmetry ys of the motor assembly 810 to the rightslider 860 a may be the same as the distance LD from the axis ofsymmetry ys of the motor assembly 810 to the left slider 860 b.

When the second arm 912 a, 912 b is fully laid with respect to the base31, the distance HD from the base 31 to the upper end of the displayunit 20 may have a minimum value.

When the second arm 912 a, 912 b is fully laid with respect to the base31, the first spring 841 a, 841 b may contact the slider 860 a, 860 b.In addition, the second spring 851 a, 851 b may contact the slider 860a, 860 b. In addition, the pusher 930 a, 930 b may contact the linkbracket 951 a, 951 b.

When the second arm 912 a, 912 b is fully laid with respect to the base31, the amount of compression of the first spring 841 a, 841 b may havea maximum value, and the magnitude of the restoring force provided tothe slider 860 a, 860 b by the first spring 841 a, 841 b may have amaximum value.

When the second arm 912 a, 912 b is fully laid with respect to the base31, the amount of compression of the second spring 851 a, 851 b may havea maximum value, and the magnitude of the restoring force provided tothe slider 860 a, 860 b by the second spring 851 a, 851 b may have amaximum value.

When the second arm 912 a, 912 b is fully laid with respect to the base31, the amount of compression of the spring 940 a, 940 b may have amaximum value, and the magnitude of the restoring force provided to thepusher 930 a, 930 b by the spring 940 a, 940 b may have a maximum value.

When the second arm 912 a, 912 b start to stand with respect to the base31, the second arm 912 a, 912 b may stand by receiving a restoring forcefrom the first spring 841 a, 841 b, the second spring 851 a, 851 b, andthe spring 940 a, 940 b. Thus, the load on the motor assembly 810 may bereduced.

Referring to FIG. 58 , as the second arm 912 a, 912 b stands withrespect to the base 31, the distance SD between the right slider 860 aand the left slider 860 b may gradually increase. Even if the distanceSD increases, the distance LD and the distance RD may be equal to eachother. That is, the right slider 860 a and the left slider 860 b may besymmetrically located with respect to the axis of symmetry ys of themotor assembly 810. In addition, the extent to which the second arm 912a, 912 b of the right link 910 a stands with respect to the base 31 andmay be equal to the extent to which the second arm 912 a, 912 b of theleft link 910 b stands with respect to the base 31.

As the second arm 912 a, 912 b stands with respect to the base 31, thedistance HD from the base 31 to the upper end of the display unit 20 maygradually increase. The display unit 20 may be unwound from the panelroller 143. Alternatively, the display unit 20 may be unfolded from thepanel roller 143.

When the second arm 912 a, 912 b fully stands up with respect to thebase 31, the first spring 841 a, 841 b may be separated from the slider860 a, 860 b. In addition, when the second arm 912 a, 912 b fully standsup with respect to the base 31, the second spring 851 a, 851 b may beseparated from the slider 860 a, 860 b. In addition, when the second arm912 a, 912 b stands up with respect to the base 31, the pusher 930 a,930 b may be separated from the link bracket 951 a, 951 b.

The separation of the first spring 841 a, 841 b from the slider 860 a,860 b, the separation of the second spring 851 a, 851 b from the slider860 a, 860 b, and the separation of the pusher 930 a, 930 b from thelink bracket 951 a, 951 b may proceed independently of each other. Thatis, the order of the separation of the first spring 841 a, 841 b fromthe slider 860 a, 860 b, the separation of the second spring 851 a, 851b from the slider 860 a, 860 b, and the separation of the pusher 930 a,930 b from the link bracket 951 a, 951 b may be mutually variable.

The angle formed between the axis xs1 parallel to the base 31 and thesecond arm 912 a may be referred to as theta R. The angle formed betweenthe axis xs1 parallel to the base 31 and the first arm 911 a may bereferred to as theta R′. The axis xs1 and x-axis may be parallel.

When the second arm 912 a is fully laid with respect to the base 31, orwhile the second arm 912 a stands up with respect to the base 31, orwhen the standing of the second arm 912 a with respect to the base 31 iscompleted, theta R and theta R′ can be maintained to be the same.

The angle formed between the axis xs2 parallel to the base 31 and thesecond arm 912 b may be referred to as theta L. The angle formed betweenthe axis xs2 parallel to the base 31 and the first arm 911 b may bereferred to as theta L′. The axis xs2 and x-axis may be parallel.

When the second arm 912 b is fully laid with respect to the base 31, orwhile the second arm 912 b stands up with respect to the base 31, orwhen the standing of the second arm 912 a with respect to the base 31 iscompleted, theta L and theta L′ can be maintained to be the same.

The axis xs1 and the axis xs2 may be the same axis mutually.

Referring to FIG. 59 , when the second arm 912 a, 912 b fully stands upwith respect to the base 31, the distance SD between the right slider860 a and the left slider 860 b may have a maximum value. Even when thedistance SD is maximized, the distance LD and the distance RD may beequal to each other.

When the second arm 912 a, 912 b fully stands up with respect to thebase 31, the distance HD from the base 31 to the upper end of thedisplay unit 20 may have a maximum value.

Referring to FIG. 60 , the link bracket 951 may be pivot-connected tothe first arm 911. The link bracket 951 may include a supporter 951F anda coupling plate 951R.

The supporter 951F may include a horizontal body 9511, a joint 9512,9512 a, and cups 9513 a, 9513 b, and 9513 c. The horizontal body 9511may have a bar shape extended laterally. The joint 9512, 9512 a may beformed below the horizontal body 9511. The joint 9512, 9512 a mayinclude a fixed plate 9512 and a pivot shaft 9512 a.

The bearing 960 may be fastened to a pivot shaft 9512 a. A plurality ofbearings 960 may be provided. The plurality of bearings 960 may includea first bearing 960 a and a second bearing 960 b. The second bearing 960b may be stacked on the first bearing 960 a. The first bearing 960 a andthe second bearing 960 b may be inserted into the pivot shaft 9512 a.Lubricating oil may be applied to the bearings 960. The assembly of thebearing 960 and the lubricating oil application may be performedsimultaneously with the coupling of the first arm 911 and the linkbracket 951, and may be performed independently of the fastening ofother structures, thereby preventing leakage of the lubricating oil.

The fixed plate 9512 may be eccentrically located in the left or rightdirection from the lower side of the horizontal body 9511. The fixedplate 9512 may have a shape of a plate 9512 extended downwardly of thehorizontal body 9511. The pivot shaft 9512 a may protrude from onesurface of the fixed plate 9512.

The cups 9513 a, 9513 b, and 9513 c may be formed while the uppersurface of the horizontal body 9511 is recessed. The cups 9513 a, 9513b, and 9513 c may be formed in such a manner that the upper surface ofthe horizontal body 9511 is recessed and the front and rear surfaces ofthe horizontal body 9511 are opened. For example, the cup 9513 a, 9513b, 9513 c may have a U-shape as a whole. The cups 9513 a, 9513 b, and9513 c may be sequentially disposed in the longitudinal direction of thehorizontal body 9511. Accordingly, stress concentration can be reduced,and fatigue breakdown of the link bracket 951 can be improved.

The coupling plate 951R may include a supporter cover 9515 and a jointcover 9516. The supporter cover 9515 may be a plate formed with a lengthcorresponding to the supporter 951F. The joint cover 9516 may have adisc shape connected to the supporter cover 9515 by being eccentric fromthe lower side of the supporter cover 9515 to the left or the right. Thecoupling plate 951R may include a plurality of holes H and h.

The plurality of holes H and h may include first coupling holes h andsecond coupling holes H. The first coupling holes h may be implementedfor mutual coupling between the supporter 951F, the coupling plate 951R,and the first arms 911. The second coupling holes H may be implementedfor coupling between the top case 950 (see FIG. 61 ) and the linkbracket 951.

Referring to FIG. 61 , the cup 9513 a may include a support portion 9513a 1 and a guide portion 9513 a 2. The support portion 9513 a 1 may formthe lower side of the cup 9513 a, and the guide portion 9513 a 2 mayform the upper side of the cup 9513 a. For example, the support portion9513 a 1 may form a semicircle or a fan shape, and the guide portion9513 a 2 may be extended from the support portion 9513 a 1 and may havea left and right side shape of an inverted trapezoid.

The top case 950 may include an inner bar 950I and a top cover 950T. Theinner bar 950I may be located in the upside or upper end of the modulecover 15, and may be coupled to the module cover 15. A couplingprotrusion 950P1, 950P2 may be mounted in an outer surface of the innerbar 950I. A plurality of coupling protrusions 950P1, 950P2 may beprovided. The number of coupling protrusions 950P1 and 950P2 maycorrespond to the number of cups 9513 a, 9513 b, and 9513 c of thesupporter 951F. For example, the coupling protrusions 950P1 and 950P2may be a pampnut. The radius of the coupling protrusion 950P1, 950P2 maycorrespond to the radius of the support portion 9513 a 1, 9513 b 1, 9513c 1 of the cup 9513 a, 9513 b, 9513 c.

Referring to FIGS. 62 and 63 , the link bracket 951 may be assembledwith the top case 950 while the link bracket 951 is coupled to the firstarm 911. In this case, the link bracket 951 may move to the top case 950according to the movement of the link 910 (see FIG. 28 ), 910 a, 910 b(see FIG. 58 ) in the vertical direction (e.g., y-axis direction). Asthe supporter 951F of the link bracket 951 approaches the top case 950,the coupling protrusions 950P1, 950P2, 950P3 may be inserted into thecups 9513 a, 9513 b, 9513 c (see FIG. 60 ) of the supporter 951F. Thecoupling protrusions 950P1, 950P2, and 950P3 are inserted into cups 9513a, 9513 b, and 9513 c of the supporter 951F, and the link bracket 951and the top case 950 may be fastened to each other by the screw S2 (seeFIG. 60 ).

Accordingly, the link bracket 951 may be naturally coupled to the topcase 950 within the movable range of the link 910, 910 a, 910 b whilenot straining the joints of the link 910, 910 a, 910 b.

Referring to FIGS. 60 and 64 , a support recess 9514 may be formed byrecessing the bottom surface of the horizontal body 9511 of thesupporter 951F. The support recess 9514 may be eccentrically located inthe lower surface of the left or right side of the horizontal body 9511.For example, when the fixed plate 9512 is located in the right side ofthe bottom surface of the horizontal body 9511, the support recess 9514may be located in the left side of the bottom surface of the horizontalbody 9511.

When the module cover 15 is rolled so that the links 910, 910 a, 910 bis fully laid with respect to the base 31, the support recess 9514 ofthe supporter 951F may be placed on the pusher 930. As described above,the pusher 930 may provide a force to the link bracket 951 in adirection of standing in the process of the standing of the link 910,910 a, 910 b, and the pusher 930 may provide a cushioning force to thelink bracket 951 in the process of folding the link 910, 910 a, and 910b.

Referring to FIG. 65 , the flexible display panel 10 may be wound aroundor unwound from the roller 143. In addition, the module cover 15 locatedbehind the display panel 10 may also be wound around or unwound from theroller 143. For example, the module cover 15 may be coupled, fastened,or attached to the rear surface of the display panel 10. The rearsurface of the module cover 15 may be wound around the roller 143earlier than the front surface of the module cover 15 or the displaypanel 10.

The module cover 15 may be extended to the lower side of the displaypanel 10 so that the front surface of the module cover 15 may be exposedto the front without being obscured by the display panel 10. The lowerend of the module cover 15 may be connected or coupled to the roller143. The S-PCB 120, also referred to as the source PCB 120 in the above,may be electrically connected to the display panel 10, and locatedadjacent to the lower side of the display panel 10. The plurality ofS-PCBs 120 may be coupled to the front surface of the module cover 15.For example, four S-PCBs 120 a, 120 b, 120 c, and 120 d may besequentially arranged in the longitudinal direction of the roller 143.The S-COF 123, also referred to as the source COF 123 in the above,connects the display panel 10 and the S-PCB 120, and may be locatedadjacent to the lower side of the display panel 10. The plurality ofS-COFs 123 may be coupled to the front surface of the module cover 15.For example, twelve S-COFs 123 may be bundled to form groups. Each groupmay have three S-COFs, and be connected to each of the four S-PCBs 120a, 120 b, 120 c, and 120 d. The S-COF 123 may be electrically connectedto the S-PCB 120 through a hole (no reference numeral) formed in a cover150 or a roof 151 described later.

The roller 143 may include a first part 331 and a second part 337 whichare screwed to each other, and the timing controller board 105 may bemounted therein. The S-PCB 120 may be connected to the timing controllerboard 105 through a cable 117 passing through a hole 331 b formed in thefirst part 331, and receive digital video data and a timing controlsignal. For example, the cable 117 may be a flexible flat cable (FFC).

The cable 117 may penetrate a hole 155 formed in the cover 150 or theroof 151 described later. For example, each of the four cables 117 a,117 b, 117 c, 117 d passes through each of the four holes 155 a, 155 b,155 c, 155 d formed in the roof 151, and may electrically connect theS-PCB 120 and the timing control board 105.

A seating portion 379 a may be formed in an outer circumference of thefirst part 331. The seating portion 379 a may be formed by cutting out apart of the outer circumferential surface of the roller 143 or the firstpart 331. The outer circumferential surface of the roller 143 may have acircumferential surface and a plane that forms the seating portion 379a. At this time, the length of the outer circumferential surface of thefirst part 331 ranging from a point facing the lower end of the modulecover 15 to a point where the seating portion 379 a starts to be formedmay be the same as or shorter than the length ranging from the lower endof the module cover 15 to the lower end of the S-PCB 120. In addition,the longitudinal length of the seating portion 379 a may be equal to orlonger than the vertical length of the S-PCB 120.

Accordingly, when the display unit 20 is wound around the roller 143,the S-PCB 120 is accommodated in the seating portion 379 a with themodule cover 15 interposed therebetween, so that the S-PCB 120 may notbe twisted or bent.

Referring to FIGS. 66 and 67 , the cover 150 may cover the S-PCB 120when the display unit 20 is wound around the roller 143. The cover 150may include a roof 151 and a side wall 153.

The roof 151 may be extended in the longitudinal direction of the roller143 to cover the S-PCB 120. The curvature of the roof 151 may correspondto the curvature of the roller 143. Both ends of the roof 151 in thecircumferential direction may be in contact with or coupled to the frontsurface of the module cover 15.

The sidewall 153 may be coupled to the front surface of the module cover15 and may support the roof 151. For example, the sidewalls 153 may beat least one pair of sidewalls 153 that are symmetrically coupled toboth longitudinal ends of the S-PCB 120. The sidewall 153 may include aplate 153 a coupled to the roof 151 and the module cover 15. The plate153 a may be perpendicular to the module cover 15, and may have asemicircular shape. The sidewall 153 may further include a protrusion153 c that protrudes outward from the plate 153 a and slides along asurface of the guide when being in contact with the guide describedlater.

The guide may contact the sidewall 153 to align the roof 151 onto theseating portion 379 a. The guide may be located adjacent to thelongitudinal end of the roller 143. For example, the guide may be atleast one pair of guides that are symmetrically coupled to bothlongitudinal sides of the roller 143. The guide may include a connector140 a and a block 140 b. The connector 140 a may be coupled to a portionof the roller 143 corresponding to the seating portion 379 a. The block140 b may be coupled to the upper side of the connector 140 a to form anacute angle with respect to the radially outward direction of the roller143 and may be opened wide from the roller 143. For example, theconnector 140 a and the block 140 b may be integrally formed.

The block 140 b may have a flat surface, which guides the sliding of theprotrusion 153 c, formed on one side (i.e., the inner side). Forexample, the protrusion 153 c may be a hemispherical member formed inthe outer surface of the plate 153 a. For example, the protrusion 153 cmay be a ball rotatably inserted into a hole formed in the plate 153 aso as to slide more smoothly on the flat surface of the block 140 b.

Meanwhile, as the position of the protrusion 153 c on the plate 153 aapproaches the end adjacent to the lower end of the module cover amongboth ends of the roof 151 in the circumferential direction, the chanceor time that the protrusion 153 c is slid by the block 140 b is reduced,so that the alignment of the cover 150 may be insufficient. In addition,as the position of the protrusion 153 c on the plate 153 a approachesthe end farther from the lower end of the module cover among both endsof the roof 151 in the circumferential direction, it is more likely thatthe protrusion 153 c may collide with the side of the block 140 b, andwhen the angle between the radially outward direction of the roller 143and the block 140 b is widened so as to solve this problem, the productvolume may be increased. That is, the protrusion 153 c may be preferablylocated in the center of the plate 153 a.

When the display unit 20 is cornerwise wound around the roller 143toward the left or right side of the roller 143 without being properlywound around the roller 143 based on the central axis of the roller 143,the protrusion 153 c may be slid along a flat surface of the adjacentblock 140 b. Assuming that FIG. 66 is an enlarged perspective viewviewed from the left side, when the display unit 20 is cornerwise woundaround the roller 143 toward the left side of the roller 143, theprotrusion 153 c may firstly contact a point P1 of the flat surface ofthe block 140 b, and then be slid up to a point P0. Here, when theprotrusion 153 c is located in the point P0, both circumferential endsof the roof 151 may be aligned into a position corresponding to thelongitudinal edge of the seating portion 379 a. Meanwhile, since theblock 140 b is inclined at an acute angle with respect to the radiallyoutward direction of the roller 143, it can be understood that theextent to which the display unit 20 is cornerwise wound around theroller 143 toward the left side of the roller 143 becomes smaller as apoint where the protrusion 153 c firstly contacts among the flat surfaceof the block 140 b progresses from P1 to P3. In addition, the abovedescription may be similarly applied to a case where the display unit 20is cornerwise wound around the roller 143 toward the right side of theroller 143.

Accordingly, after the cover 150 or the roof 151 is aligned into theseating portion 379 a, the outer circumferential surface of the roller143 becomes the circumferential surface as a whole, so that the displayunit 20 can be stably wound around or unwound from the roller 143 (SeeFIG. 67 ). In addition, the S-PCB 120 accommodated in the seatingportion 379 a may be prevented from being damaged by the display unit 20to be wound around later.

Referring to FIG. 68 , the guide 141 may contact the protrusion 153 c ofthe sidewall 153 to align the roof 151 into the seating portion 379 a.The guide 141 may include a connector 141 a, a plurality of rotatingbodies 141 c, and a belt 141 d. The connector 141 a may be coupled to aportion of the roller 143 corresponding to the seating portion 379 a.The belt 141 d may surround the plurality of rotating bodies 141 c andmay be opened wide from the roller 143 at an acute angle with respect tothe radially outward direction of the roller 143. At this time, at leastone of the plurality of rotating bodies 141 c is rotatably coupled tothe connector 141 a through the bar 141 e, so that the position of thebelt 141 d surrounding the plurality of rotating bodies 141 c can befixed.

For example, the plurality of rotating bodies 141 c may be a pluralityof cylinders extended long. For example, the plurality of rotatingbodies 141 c may be a plurality of balls. The belt 141 d may rotate incorrespondence with to the rotation of the plurality of rotating bodies141 c and guide the sliding of the contacted protrusion 153 c.Accordingly, the protrusion 153 c may slide more smoothly in the guide141 described with reference to FIG. 68 , in comparison with the guidedescribed with reference to FIG. 66 .

Referring to FIG. 69 , the guide 142 may contact the sidewall 153 toalign the roof 151 into the seating portion 379 a. The guide 142 may belocated from a portion of the roller 143 to which the lower end of themodule cover 15 is coupled to a portion corresponding to the seatingportion 379 a. The guide 142 may be parallel to the radially outwarddirection of the roller 143. In this case, the module cover 15 maycontact the guide 142 before being wound around the roller 143.

Accordingly, when the display unit 20 is wound around the roller 143,the module cover 15 maintains a contact with the guide 142, so that thecover 150 or the roof 151 can be aligned to the seating portion 379 a.

Referring to FIG. 70 , the seating portion 379 b may be formed in anouter circumference of the first part 331. The seating portion 379 b maybe formed by cutting out a part of the outer circumferential surface ofthe roller 143 or the first part 331. The outer circumferential surfaceof the roller 143 may be formed of a cylindrical surface, a plane thatis stepped inward from the cylindrical surface and forms the seatingportion 379 b, and an inclined surface connecting the cylindricalsurface and the plane.

Accordingly, the S-PCB 120 is located toward the inside of the roller143 by a space B in which the seating portion 379 b is recessed from thecircumferential surface such that a space for installing the cover 150′described later on the module cover 15 can be increased, therebyincreasing the convenience of work.

Referring to FIGS. 71 and 72 , a cover 150′ may cover the S-PCB 120 whenthe display unit 20 is wound around the roller 143. The cover 150′ mayinclude a roof 151′ and a side wall 153′.

The roof 151′ may be extended in the longitudinal direction of theroller 143 to cover the S-PCB 120. The curvature of the roof 151′ maycorrespond to the curvature of the roller 143. Both circumferential endsof the roof 151′ may be spaced apart from the front surface of themodule cover 15.

The sidewall 153′ may be coupled to the front surface of the modulecover 15 and may support the roof 151′. For example, the sidewalls 153may be at least one pair of sidewalls 153′ that are symmetricallycoupled to both longitudinal ends of the S-PCB 120. The sidewall 153′may include a plate 153 a′ and a pillar 153 b′.

The plate 153 a′ may be coupled to the roof 151′. The plate 153 a′ isperpendicular to the module cover 15 and may have a semicircular shape.The sidewall 153′ may further include a protrusion 153 c′ that protrudesoutward from the plate 153 a′ and slides along a surface of the guidewhen being in contact with the guide described later.

The pillar 153 b′ may be located between the plate 153 a′ and the modulecover 15. The pillar 153 b′ may be coupled to each of the plate 153 a′and the module cover 15 so that the roof 151′ coupled to the plate 153a′ is spaced apart from the module cover 15. For example, the pillar 153b′ may be perpendicular to the module cover 15, and have a rectangularpillar shape.

The pillar 153 b′ may be located between portions of the module cover 15that are wound around the seating portion 379 b. Both circumferentialends of the roof 151′ may be spaced apart from the pillar 153 b′ by agiven distance, and may be adjacent to the longitudinal edge of theseating portion 379 b when the S-PCB 120 is accommodated in the seatingportion 379 b.

In detail, referring to FIG. 72 , it is assumed that the thickness ofthe module cover 15 is t, the length of an inclined surface connecting acylindrical surface in the outer circumferential surface of the roller143 and the seating portion 379 b recessed to be stepped inwardly isAD1, the external angle formed between the inclined surface and theseating portion 379 b is theta P, and the pillar 153 b′ is located inthe end of the portion of the module cover 15 wound around the seatingportion 379 b.

AD4=AD1−AD2+AD3 is the length of the portion of the module cover 15corresponding to the portion wound around the inclined surface, and atthis time, it is assumed that AD2=t*tan(theta P/2), and AD3 has a valuet. In this case, both circumferential ends of the roof 151′ may behorizontally spaced apart by the distance the AD4*cos(theta P) from thepillar 153 b′ located at the height of AD4*sin(theta P) from the frontsurface of the module cover 15, and may be adjacent to the longitudinaledge of the seating portion 379 b when the S-PCB 120 is accommodated inthe seating portion 379 b.

When the display unit 20 is cornerwise wound around the roller 143toward the left or right side of the roller 143 without being properlywound around the roller 143 based on the central axis of the roller 143,the protrusion 153 c′ may be slid along a flat surface of the adjacentblock 140 b. Assuming that FIG. 71 is an enlarged perspective viewviewed from the left side, when the display unit 20 is cornerwise woundaround the roller 143 toward the left side of the roller 143, theprotrusion 153 c′ may firstly contact a point Q1 of the flat surface ofthe block 140 b, and then be slid up to a point Q0. Here, when theprotrusion 153 c′ is located in the point Q0, both circumferential endsof the roof 151′ may be aligned into a position corresponding to thelongitudinal edge of the seating portion 379 b. Meanwhile, since theblock 140 b is inclined at an acute angle with respect to the radiallyoutward direction of the roller 143, it can be understood that theextent to which the display unit 20 is cornerwise wound around theroller 143 toward the left side of the roller 143 becomes smaller as apoint where the protrusion 153 c′ firstly contacts among the flatsurface of the block 140 b progresses from P1 to P3. In addition, theabove description may be similarly applied to a case where the displayunit 20 is cornerwise wound around the roller 143 toward the right sideof the roller 143.

Accordingly, after the cover 150′ or the roof 151′ is aligned into theseating portion 379 b, the outer circumferential surface of the roller143 becomes the circumferential surface as a whole, so that the displayunit 20 can be stably wound around or unwound from the roller 143 (SeeFIG. 72 ). In addition, the S-PCB 120 accommodated in the seatingportion 379 b may be prevented from being damaged by the display unit 20to be wound around later.

Referring to FIG. 73 , the guide 141 may contact the protrusion 153 c′of the sidewall 153′ to align the roof 151′ into the seating portion 379b. The guide 141 may include a connector 141 a, a plurality of rotatingbodies 141 c, and a belt 141 d. The belt 141 d may rotate in response tothe rotation of the plurality of rotating bodies 141 c, and guide thesliding of the protrusion 153 c′ contacting it. Accordingly, incomparison with the guide described with reference to FIG. 72 , theprotrusion 153 c may slide more smoothly in the guide 141 described withreference to FIG. 73 .

Referring to FIG. 74 , the guide 142 may contact the sidewall 153′ toalign the roof 151′ into the seating portion 379 b. The guide 142 may belocated from the portion of the roller 143 to which the lower end of themodule cover 15 is coupled to the portion corresponding to the seatingportion 379 b. The guide 142 may be parallel to the radially outwarddirection of the roller 143. In this case, the module cover 15 maycontact the guide 142 before being wound around the roller 143.

Accordingly, when the display unit 20 is wound around the roller 143,the module cover 15 maintains a contact with the guide 142, so that thecover 150′ or the roof 151′ can be aligned in the seating portion 379 a.

Referring to FIG. 75 , the module cover 15 is located in the rear of thedisplay panel 10, and the front surface of the module cover 15 may bewound around the roller 143 earlier than the rear surface of the modulecover 15. The plurality of S-PCBs 120 are located adjacent to the lowerside of the display panel 10, and may be coupled to the front surface ofthe module cover 15.

The seating portion 379 may be formed in the outer circumference of thefirst part 331. The seating portion 379 may be formed by cutting out apart of the outer circumferential surface of the roller 143 or the firstpart 331. The outer circumferential surface of the roller 143 may beformed of a cylindrical surface, a plane that is stepped inward from thecylindrical surface and forms the seating portion 379, and an inclinedsurface connecting the cylindrical surface and the plane. Accordingly,when the display unit 20 is wound around the roller 143, the S-PCB 120may be accommodated in the seating portion 379 so that the S-PCB 120 maynot be twisted or bent.

Meanwhile, when the cover 150′ described above with reference to FIGS.71 and 72 is coupled to the rear surface of the module cover 15 so thatthe display unit 20 is wound around the roller 143, it may cover theS-PCB 120 with the module cover 15 interposed therebetween. In thiscase, the guide described above with reference to FIGS. 71 and 72 may beapplied so that the cover 150′ is aligned into the seating portion 379.Accordingly, the display unit 20 that is wound around after the S-PCB120 is accommodated in the seating portion 379 may be stably wound orunwound.

In addition, the cover 150′ and the guide 141 described above withreference to FIG. 73 or the cover 150′ and the guide 142 described abovewith reference to FIG. 74 may be applied to the display device describedwith reference to FIG. 75 . In addition, the cover 150 and the guide141, 142 along with the shape of the outer circumferential surface ofthe roller 143 described above with reference to FIGS. 65 to 69 may beapplied to the display device described with reference to FIG. 75 .

Referring to FIG. 76 , the seating portion 379 c may be formed in theouter circumference of the first part 331. The seating portion 379 c maybe formed by cutting out a part of the outer circumferential surface ofthe roller 143 or the first part 331. A plurality of seating portions379 c may be formed in the outer circumferential surface of the roller143 or the first part 331. The number of the plurality of seating parts379 c may correspond to the number of the plurality of S-PCBs 120. Forexample, when four S-PCBs 120 a, 120 b, 120 c, and 120 d aresequentially arranged in the longitudinal direction of the roller 143 onthe module cover 15, four seating portions 379 c 1, 379 c 2, 379 c 3,and 379 c 4 may be sequentially arranged on the first part 331 in thelongitudinal direction of the roller 143.

The plurality of seating portions 379 c are spaced apart from eachother, and a portion of the roller 143 in which the seating portions 379c is not formed may form a circumferential surface without cut-out. Inother words, the outer circumferential surface corresponding to aportion where each of the plurality of seating portions 379 c is formedin the roller 143 may have a cylindrical surface and a plane that formsthe seating portion 379 a. However, the outer circumferential surfacecorresponding to the portion where the plurality of seating portions 379c are not formed in the roller 143 may be formed as a cylindricalsurface.

That is, the display unit 20 wound around after the S-PCB 120 isaccommodated in the seating portion 379 c may be wound around in acircle without contacting the S-PCB 120 by the portion 143 a, 143 b, and143 c in which the plurality of seating portions 379 c are not formed inthe roller 143 and the outer circumferential surface is a cylindricalsurface, so that the display unit 20 can stably be wound around orunwound from the roller 143 while preventing the S-PCB 120 from beingdamaged.

In accordance with an aspect of the present disclosure, provided is adisplay device including a flexible display panel, a source printedcircuit board (S-PCB) located adjacent to a lower side of the flexibledisplay panel and electrically coupled to the flexible display panel, aroller comprising a seating portion accommodating the S-PCB, wherein theseating portion is formed by removing a part of an outer circumferentialsurface of the roller, wherein the flexible display panel is woundaround or unwound from the roller, and a cover extending in alongitudinal direction of the roller to cover the S-PCB.

In accordance with another aspect of the present disclosure, a curvatureof the cover may correspond to a curvature of the roller.

In accordance with another aspect of the present disclosure, the displaydevice may further include a module cover coupled to a rear surface ofthe flexible display panel, wherein the module cover may include a lowerend coupled to the roller, a roof extended in the longitudinal directionof the roller to cover the S-PCB, and a sidewall coupled to the modulecover.

In accordance with another aspect of the present disclosure, the displaydevice may further include a guide located adjacent to a longitudinalend of the roller and in contact with the sidewall to align the roofonto the seating portion.

In accordance with another aspect of the present disclosure, the outercircumferential surface of the roller may include a first portioncorresponding to a cylindrical shape and a second portion correspondingto a plane forming the seating portion, wherein circumferential ends ofthe roof may be coupled to a front surface of the module cover, and thesidewall may include a plate coupled to the roof and the module cover.

In accordance with another aspect of the present disclosure, the outercircumferential surface of the roller may include a first portioncorresponding to cylindrical shape, a second portion corresponding to aplane that is recessed from the cylindrical shape to form the seatingportion, and a third portion corresponding to an inclined surfaceconnecting the cylindrical shape and the plane, wherein circumferentialends of the roof may be spaced apart from a front surface of the modulecover, wherein the sidewall may include a plate coupled to the roof, anda pillar located between the plate and the module cover.

In accordance with another aspect of the present disclosure, the pillarmay be located between a portion of the module cover wound around theseating portion, and wherein the circumferential ends of the roof may bespaced apart from the pillar and adjacent to a longitudinal edge of theseating portion when the S-PCB is accommodated in the seating portion.

In accordance with another aspect of the present disclosure, the guidemay be coupled to a portion of the roller coupled to a lower end of themodule cover and may be parallel to a radially outward direction of theroller, wherein the module cover may be in contact with the guide.

In accordance with another aspect of the present disclosure, the guidemay further include a connector coupled to a seating portion of theroller, and a block coupled to an upper side of the connector to form anacute angle with respect to a radially outward direction of the rollerand protrudes from the roller, and wherein the sidewall may furtherinclude a protrusion that protrudes outward from the plate and isconfigured to slide along a surface of the guide.

In accordance with another aspect of the present disclosure, the blockmay further include a flat surface for guiding the sliding of theprotrusion.

In accordance with another aspect of the present disclosure, the guidemay further include a plurality of ball bearings, and a belt whichsurrounds the plurality of ball bearings such that the belt moves inresponse to rotations from the plurality of ball bearings for guidingthe sliding of the protrusions.

In accordance with another aspect of the present disclosure, theprotrusion may correspond to at least a ball rotatably inserted into ahole formed in the plate or a hemispherical member formed in an outersurface of the plate.

In accordance with another aspect of the present disclosure, the displaydevice may further include a cable for electrically connecting the S-PCBand a timing controller board, wherein the cable may pass through theroof.

In accordance with another aspect of the present disclosure, theflexible display panel may be wound around the roller such that the rearsurface of the module cover is wound around the roller earlier than afront surface of the module cover or the flexible display panel, and theS-PCB and the cover may be coupled to the front surface of the modulecover.

In accordance with another aspect of the present disclosure, theflexible display panel may be wound around the roller such that a frontsurface of the module cover is wound around the roller earlier than therear surface of the module cover, and the S-PCB and the cover may becoupled to the front surface of the module cover.

The effects of the display device according to the present disclosurewill be described as follows.

According to at least one of the embodiments of the present disclosure,it is possible to provide a display device capable of preventing S-PCBdamage that may occur in the process of winding a display panel around aroller or unwinding the flexible display panel from the roller.

According to at least one of the embodiments of the present disclosure,it is possible to provide a display device in which a display panel canbe stably wound around or unwound from a roller having a flat surface onwhich S-PCB is seated.

According to at least one of the embodiments of the present disclosure,it is possible to provide a display device capable of preventing a S-PCBcover from being dislocated from its regular position in the process ofwinding a display panel around a roller or unwinding the flexibledisplay panel from the roller.

Certain embodiments or other embodiments of the disclosure describedabove are not mutually exclusive or distinct from each other. Any or allelements of the embodiments of the disclosure described above may becombined or combined with each other in configuration or function.

For example, a configuration “A” described in one embodiment of thedisclosure and the drawings and a configuration “B” described in anotherembodiment of the disclosure and the drawings may be combined with eachother. Namely, although the combination between the configurations isnot directly described, the combination is possible except in the casewhere it is described that the combination is impossible.

Although embodiments have been described with reference to a number ofillustrative embodiments thereof, it should be understood that numerousother modifications and embodiments can be devised by those skilled inthe art that will fall within the scope of the principles of thisdisclosure. More particularly, various variations and modifications arepossible in the component parts and/or arrangements of the subjectcombination arrangement within the scope of the disclosure, the drawingsand the appended claims. In addition to variations and modifications inthe component parts and/or arrangements, alternative uses will also beapparent to those skilled in the art

What is claimed is:
 1. A display device comprising: a flexible displaypanel; a source printed circuit board (S-PCB) located adjacent to alower side of the flexible display panel and electrically connected withthe flexible display panel; a roller comprising a seating portionaccommodating the S-PCB, wherein the flexible display panel is woundaround or unwound from the roller; a module cover coupled to a rearsurface of the flexible display panel; and a cover adjacent to themodule cover, the cover extending in a longitudinal direction of theroller to cover the S-PCB, wherein the cover comprises a roof extendedin the longitudinal direction of the roller to cover the S-PCB and asidewall formed at an end of the roof, wherein an outer circumferentialsurface of the roller comprises a first portion corresponding to acylindrical shape, a second portion corresponding to a plane that isrecessed from the cylindrical shape to form the seating portion, and athird portion corresponding to an inclined surface connecting thecylindrical shape and the plane, wherein circumferential ends of theroof are spaced apart from a front surface of the module cover, whereinthe sidewall comprises: a plate coupled to the roof; and a pillarlocated between the plate and the module cover.
 2. The display device ofclaim 1, wherein a curvature of the cover corresponds to a curvature ofthe roller.
 3. The display device of claim 1, wherein the cover iscoupled with the module cover.
 4. The display device of claim 3, furthercomprising a guide located adjacent to a longitudinal end of the rollerand in contact with the sidewall to align the roof onto the seatingportion.
 5. The display device of claim 4, wherein the outercircumferential surface of the roller comprises a first portioncorresponding to a cylindrical shape and a second portion correspondingto a plane forming the seating portion, wherein circumferential ends ofthe roof are coupled to a front surface of the module cover.
 6. Thedisplay device of claim 1, wherein the pillar is located between aportion of the module cover wound around the seating portion, andwherein the circumferential ends of the roof are spaced apart from thepillar and adjacent to a longitudinal edge of the seating portion whenthe S-PCB is accommodated in the seating portion.
 7. The display deviceof claim 5, wherein the guide is coupled to a portion of the rollercoupled to a lower end of the module cover and is parallel to a radiallyoutward direction of the roller, wherein the module cover is in contactwith the guide.
 8. The display device of claim 1, further comprising aguide, wherein the guide is coupled to a portion of the roller coupledto a lower end of the module cover and is parallel to a radially outwarddirection of the roller, wherein the module cover is in contact with theguide.
 9. The display device of claim 5, wherein the guide furthercomprises: a connector coupled to the seating portion of the roller, anda block coupled to an upper side of the connector to form an acute anglewith respect to a radially outward direction of the roller and protrudesfrom the roller, and wherein the sidewall further comprises a protrusionthat protrudes outward from a plate and is configured to slide along asurface of the guide.
 10. The display device of claim 1, furthercomprising a guide, wherein the guide further comprises: a connectorcoupled to the seating portion of the roller, and a block coupled to anupper side of the connector to form an acute angle with respect to aradially outward direction of the roller and protrudes from the roller,and wherein the sidewall further comprises a protrusion that protrudesoutward from the plate and slides along a surface of the guide whilebeing in contact with the guide.
 11. The display device of claim 10,wherein the block further comprises a flat surface for guiding thesliding of the protrusion.
 12. The display device of claim 10, whereinthe guide further comprises: a plurality of ball bearings, and a beltwhich surrounds the plurality of ball bearings such that the belt movesin response to rotations from the plurality of ball bearings for guidingthe sliding of the protrusions.
 13. The display device of claim 10,wherein the protrusion corresponds to at least a ball rotatably insertedinto a hole formed in the plate or a hemispherical member formed in anouter surface of the plate.
 14. The display device of claim 3, furthercomprising a cable for electrically connecting the S-PCB and a timingcontroller board, wherein the cable passes through the roof.
 15. Thedisplay device of claim 3, wherein the flexible display panel is woundaround the roller such that the rear surface of the module cover iswound around the roller earlier than a front surface of the module coveror the flexible display panel, and the S-PCB and the cover are coupledto the front surface of the module cover.
 16. The display device ofclaim 3, wherein the flexible display panel is wound around the rollersuch that a front surface of the module cover is wound around the rollerearlier than the rear surface of the module cover, and the S-PCB and thecover is coupled to the front surface of the module cover.